{"abstract":"A train far over the curve only gets a warning.","category":"Railway interlocking logic","checks":8,"contract":"Permitted speed at the train is sqrt(vt^2 + 2*a*d) with vt the target speed in m/s, a = decel_cms2/100 m/s^2 and d = max(distance - safety margin, 0); convert back to km/h, truncate to an integer (never round up) and cap at line speed. Action is brake if speed > permitted + brake margin, else warning if speed > permitted + warn margin, else none.","contract_signature":"x","evaluation_group":"w2-railway_interlocking_logic-atp-braking-curve","failed_approach":"Summing both margins for the brake threshold delays the intervention.","family":"w2-railway_interlocking_logic-atp-braking-curve-intervention-precedence","id":"FA-67076","implementations":{"attempt":{"sha256":"fc2e8dbfae03da175b9206823a13ef31b23c6f989d9a6e3c51d87e45edb5f0b4","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport math\nN = 1\nobservations = []\ndef solve(x):\n    vt = x['target_kmh'] / 3.6\n    d = max(x['distance_m'] - x['safety_margin_m'], 0)\n    a = x['decel_cms2'] / 100\n    vp = math.sqrt(vt * vt + 2 * a * d) * 3.6\n    permitted = min(int(vp), x['line_kmh'])\n    v = x['speed_kmh']\n    if v > permitted + x['warn_margin_kmh'] + x['brake_margin_kmh']:\n        action = 'brake'\n    elif v > permitted + x['warn_margin_kmh']:\n        action = 'warning'\n    else:\n        action = 'none'\n    return {'permitted': permitted, 'action': action}\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[('regression: curve above line speed', {'target_kmh': 0, 'distance_m': 2500, 'safety_margin_m': 50, 'decel_cms2': 70, 'line_kmh': 120, 'speed_kmh': 150, 'warn_margin_kmh': 5, 'brake_margin_kmh': 10}, {'permitted': 120, 'action': 'brake'}), ('regression: fractional permitted speed', {'target_kmh': 20, 'distance_m': 100, 'safety_margin_m': 0, 'decel_cms2': 70, 'line_kmh': 160, 'speed_kmh': 60, 'warn_margin_kmh': 5, 'brake_margin_kmh': 10}, {'permitted': 47, 'action': 'brake'}), ('sampled regression 2', {'target_kmh': 0, 'distance_m': 250, 'safety_margin_m': 50, 'decel_cms2': 50, 'line_kmh': 160, 'speed_kmh': 122, 'warn_margin_kmh': 5, 'brake_margin_kmh': 10}, {'permitted': 50, 'action': 'brake'}), ('sampled regression 19', {'target_kmh': 0, 'distance_m': 40, 'safety_margin_m': 50, 'decel_cms2': 100, 'line_kmh': 160, 'speed_kmh': 17, 'warn_margin_kmh': 3, 'brake_margin_kmh': 15}, {'permitted': 0, 'action': 'brake'}), ('boundary: stop target inside the margin', {'target_kmh': 0, 'distance_m': 40, 'safety_margin_m': 50, 'decel_cms2': 70, 'line_kmh': 160, 'speed_kmh': 10, 'warn_margin_kmh': 5, 'brake_margin_kmh': 10}, {'permitted': 0, 'action': 'warning'}), ('sampled regression 1', {'target_kmh': 0, 'distance_m': 0, 'safety_margin_m': 0, 'decel_cms2': 100, 'line_kmh': 160, 'speed_kmh': 139, 'warn_margin_kmh': 5, 'brake_margin_kmh': 15}, {'permitted': 0, 'action': 'brake'}), ('sampled regression 4', {'target_kmh': 0, 'distance_m': 100, 'safety_margin_m': 20, 'decel_cms2': 100, 'line_kmh': 80, 'speed_kmh': 136, 'warn_margin_kmh': 5, 'brake_margin_kmh': 15}, {'permitted': 45, 'action': 'brake'}), ('control 7', {'target_kmh': 40, 'distance_m': 2500, 'safety_margin_m': 20, 'decel_cms2': 50, 'line_kmh': 160, 'speed_kmh': 59, 'warn_margin_kmh': 3, 'brake_margin_kmh': 10}, {'permitted': 160, 'action': 'none'})], [('regression: fractional permitted speed', {'target_kmh': 20, 'distance_m': 100, 'safety_margin_m': 0, 'decel_cms2': 70, 'line_kmh': 160, 'speed_kmh': 60, 'warn_margin_kmh': 5, 'brake_margin_kmh': 10}, {'permitted': 47, 'action': 'brake'}), ('sampled regression 19', {'target_kmh': 0, 'distance_m': 40, 'safety_margin_m': 50, 'decel_cms2': 100, 'line_kmh': 160, 'speed_kmh': 17, 'warn_margin_kmh': 3, 'brake_margin_kmh': 15}, {'permitted': 0, 'action': 'brake'}), ('boundary: curve below line speed', {'target_kmh': 0, 'distance_m': 600, 'safety_margin_m': 50, 'decel_cms2': 70, 'line_kmh': 160, 'speed_kmh': 100, 'warn_margin_kmh': 5, 'brake_margin_kmh': 10}, {'permitted': 99, 'action': 'none'}), ('regression: curve above line speed', {'target_kmh': 0, 'distance_m': 2500, 'safety_margin_m': 50, 'decel_cms2': 70, 'line_kmh': 120, 'speed_kmh': 150, 'warn_margin_kmh': 5, 'brake_margin_kmh': 10}, {'permitted': 120, 'action': 'brake'}), ('boundary: warning boundary', {'target_kmh': 40, 'distance_m': 0, 'safety_margin_m': 50, 'decel_cms2': 70, 'line_kmh': 160, 'speed_kmh': 45, 'warn_margin_kmh': 5, 'brake_margin_kmh': 10}, {'permitted': 40, 'action': 'none'}), ('control 12', {'target_kmh': 40, 'distance_m': 600, 'safety_margin_m': 20, 'decel_cms2': 100, 'line_kmh': 160, 'speed_kmh': 133, 'warn_margin_kmh': 3, 'brake_margin_kmh': 15}, {'permitted': 128, 'action': 'warning'}), ('control 15', {'target_kmh': 0, 'distance_m': 600, 'safety_margin_m': 20, 'decel_cms2': 70, 'line_kmh': 160, 'speed_kmh': 43, 'warn_margin_kmh': 3, 'brake_margin_kmh': 10}, {'permitted': 102, 'action': 'none'}), ('control 18', {'target_kmh': 60, 'distance_m': 1200, 'safety_margin_m': 20, 'decel_cms2': 70, 'line_kmh': 120, 'speed_kmh': 6, 'warn_margin_kmh': 5, 'brake_margin_kmh': 10}, {'permitted': 120, 'action': 'none'})], [('regression: curve above line speed', {'target_kmh': 0, 'distance_m': 2500, 'safety_margin_m': 50, 'decel_cms2': 70, 'line_kmh': 120, 'speed_kmh': 150, 'warn_margin_kmh': 5, 'brake_margin_kmh': 10}, {'permitted': 120, 'action': 'brake'}), ('regression: fractional permitted speed', {'target_kmh': 20, 'distance_m': 100, 'safety_margin_m': 0, 'decel_cms2': 70, 'line_kmh': 160, 'speed_kmh': 60, 'warn_margin_kmh': 5, 'brake_margin_kmh': 10}, {'permitted': 47, 'action': 'brake'}), ('sampled regression 34', {'target_kmh': 0, 'distance_m': 0, 'safety_margin_m': 0, 'decel_cms2': 70, 'line_kmh': 120, 'speed_kmh': 96, 'warn_margin_kmh': 5, 'brake_margin_kmh': 15}, {'permitted': 0, 'action': 'brake'}), ('sampled regression 77', {'target_kmh': 40, 'distance_m': 40, 'safety_margin_m': 50, 'decel_cms2': 100, 'line_kmh': 80, 'speed_kmh': 51, 'warn_margin_kmh': 5, 'brake_margin_kmh': 8}, {'permitted': 40, 'action': 'brake'}), ('boundary: warning boundary', {'target_kmh': 40, 'distance_m': 0, 'safety_margin_m': 50, 'decel_cms2': 70, 'line_kmh': 160, 'speed_kmh': 45, 'warn_margin_kmh': 5, 'brake_margin_kmh': 10}, {'permitted': 40, 'action': 'none'}), ('control 23', {'target_kmh': 60, 'distance_m': 100, 'safety_margin_m': 50, 'decel_cms2': 70, 'line_kmh': 80, 'speed_kmh': 13, 'warn_margin_kmh': 5, 'brake_margin_kmh': 8}, {'permitted': 67, 'action': 'none'}), ('control 26', {'target_kmh': 60, 'distance_m': 2500, 'safety_margin_m': 50, 'decel_cms2': 70, 'line_kmh': 160, 'speed_kmh': 86, 'warn_margin_kmh': 3, 'brake_margin_kmh': 10}, {'permitted': 160, 'action': 'none'}), ('control 29', {'target_kmh': 0, 'distance_m': 250, 'safety_margin_m': 0, 'decel_cms2': 70, 'line_kmh': 120, 'speed_kmh': 4, 'warn_margin_kmh': 5, 'brake_margin_kmh': 10}, {'permitted': 67, 'action': 'none'})], [('regression: fractional permitted speed', {'target_kmh': 20, 'distance_m': 100, 'safety_margin_m': 0, 'decel_cms2': 70, 'line_kmh': 160, 'speed_kmh': 60, 'warn_margin_kmh': 5, 'brake_margin_kmh': 10}, {'permitted': 47, 'action': 'brake'}), ('sampled regression 46', {'target_kmh': 0, 'distance_m': 100, 'safety_margin_m': 20, 'decel_cms2': 100, 'line_kmh': 120, 'speed_kmh': 73, 'warn_margin_kmh': 5, 'brake_margin_kmh': 15}, {'permitted': 45, 'action': 'brake'}), ('sampled regression 19', {'target_kmh': 0, 'distance_m': 40, 'safety_margin_m': 50, 'decel_cms2': 100, 'line_kmh': 160, 'speed_kmh': 17, 'warn_margin_kmh': 3, 'brake_margin_kmh': 15}, {'permitted': 0, 'action': 'brake'}), ('boundary: between warning and brake', {'target_kmh': 40, 'distance_m': 0, 'safety_margin_m': 50, 'decel_cms2': 70, 'line_kmh': 160, 'speed_kmh': 48, 'warn_margin_kmh': 5, 'brake_margin_kmh': 10}, {'permitted': 40, 'action': 'warning'}), ('boundary: stop target inside the margin', {'target_kmh': 0, 'distance_m': 40, 'safety_margin_m': 50, 'decel_cms2': 70, 'line_kmh': 160, 'speed_kmh': 10, 'warn_margin_kmh': 5, 'brake_margin_kmh': 10}, {'permitted': 0, 'action': 'warning'}), ('sampled regression 34', {'target_kmh': 0, 'distance_m': 0, 'safety_margin_m': 0, 'decel_cms2': 70, 'line_kmh': 120, 'speed_kmh': 96, 'warn_margin_kmh': 5, 'brake_margin_kmh': 15}, {'permitted': 0, 'action': 'brake'}), ('sampled regression 37', {'target_kmh': 20, 'distance_m': 2500, 'safety_margin_m': 20, 'decel_cms2': 70, 'line_kmh': 80, 'speed_kmh': 168, 'warn_margin_kmh': 5, 'brake_margin_kmh': 10}, {'permitted': 80, 'action': 'brake'}), ('control 40', {'target_kmh': 0, 'distance_m': 600, 'safety_margin_m': 50, 'decel_cms2': 50, 'line_kmh': 160, 'speed_kmh': 70, 'warn_margin_kmh': 5, 'brake_margin_kmh': 15}, {'permitted': 84, 'action': 'none'})], [('regression: curve above line speed', {'target_kmh': 0, 'distance_m': 2500, 'safety_margin_m': 50, 'decel_cms2': 70, 'line_kmh': 120, 'speed_kmh': 150, 'warn_margin_kmh': 5, 'brake_margin_kmh': 10}, {'permitted': 120, 'action': 'brake'}), ('regression: fractional permitted speed', {'target_kmh': 20, 'distance_m': 100, 'safety_margin_m': 0, 'decel_cms2': 70, 'line_kmh': 160, 'speed_kmh': 60, 'warn_margin_kmh': 5, 'brake_margin_kmh': 10}, {'permitted': 47, 'action': 'brake'}), ('sampled regression 66', {'target_kmh': 0, 'distance_m': 100, 'safety_margin_m': 50, 'decel_cms2': 50, 'line_kmh': 80, 'speed_kmh': 140, 'warn_margin_kmh': 3, 'brake_margin_kmh': 15}, {'permitted': 25, 'action': 'brake'}), ('boundary: stop target inside the margin', {'target_kmh': 0, 'distance_m': 40, 'safety_margin_m': 50, 'decel_cms2': 70, 'line_kmh': 160, 'speed_kmh': 10, 'warn_margin_kmh': 5, 'brake_margin_kmh': 10}, {'permitted': 0, 'action': 'warning'}), ('boundary: target speed release', {'target_kmh': 40, 'distance_m': 0, 'safety_margin_m': 50, 'decel_cms2': 70, 'line_kmh': 160, 'speed_kmh': 44, 'warn_margin_kmh': 5, 'brake_margin_kmh': 10}, {'permitted': 40, 'action': 'none'}), ('sampled regression 45', {'target_kmh': 20, 'distance_m': 40, 'safety_margin_m': 50, 'decel_cms2': 70, 'line_kmh': 80, 'speed_kmh': 133, 'warn_margin_kmh': 5, 'brake_margin_kmh': 10}, {'permitted': 20, 'action': 'brake'}), ('control 48', {'target_kmh': 40, 'distance_m': 100, 'safety_margin_m': 20, 'decel_cms2': 100, 'line_kmh': 160, 'speed_kmh': 75, 'warn_margin_kmh': 3, 'brake_margin_kmh': 15}, {'permitted': 60, 'action': 'warning'}), ('control 51', {'target_kmh': 60, 'distance_m': 600, 'safety_margin_m': 0, 'decel_cms2': 50, 'line_kmh': 160, 'speed_kmh': 8, 'warn_margin_kmh': 5, 'brake_margin_kmh': 8}, {'permitted': 106, 'action': 'none'})]]\nfor label, args, expected in fixtures[N-1]:\n    check(label, solve(args), expected)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"broken":{"sha256":"837841fad91055efba5120d6c659688bc58a59c13c830e8cbd0d0f0164a82829","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport math\nN = 1\nobservations = []\ndef solve(x):\n    vt = x['target_kmh'] / 3.6\n    d = max(x['distance_m'] - x['safety_margin_m'], 0)\n    a = x['decel_cms2'] / 100\n    vp = math.sqrt(vt * vt + 2 * a * d) * 3.6\n    permitted = min(int(vp), x['line_kmh'])\n    v = x['speed_kmh']\n    if v > permitted + x['warn_margin_kmh']:\n        action = 'warning'\n    elif v > permitted + x['brake_margin_kmh']:\n        action = 'brake'\n    else:\n        action = 'none'\n    return {'permitted': permitted, 'action': action}\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[('regression: curve above line speed', {'target_kmh': 0, 'distance_m': 2500, 'safety_margin_m': 50, 'decel_cms2': 70, 'line_kmh': 120, 'speed_kmh': 150, 'warn_margin_kmh': 5, 'brake_margin_kmh': 10}, {'permitted': 120, 'action': 'brake'}), ('regression: fractional permitted speed', {'target_kmh': 20, 'distance_m': 100, 'safety_margin_m': 0, 'decel_cms2': 70, 'line_kmh': 160, 'speed_kmh': 60, 'warn_margin_kmh': 5, 'brake_margin_kmh': 10}, {'permitted': 47, 'action': 'brake'}), ('sampled regression 2', {'target_kmh': 0, 'distance_m': 250, 'safety_margin_m': 50, 'decel_cms2': 50, 'line_kmh': 160, 'speed_kmh': 122, 'warn_margin_kmh': 5, 'brake_margin_kmh': 10}, {'permitted': 50, 'action': 'brake'}), ('sampled regression 19', {'target_kmh': 0, 'distance_m': 40, 'safety_margin_m': 50, 'decel_cms2': 100, 'line_kmh': 160, 'speed_kmh': 17, 'warn_margin_kmh': 3, 'brake_margin_kmh': 15}, {'permitted': 0, 'action': 'brake'}), ('boundary: stop target inside the margin', {'target_kmh': 0, 'distance_m': 40, 'safety_margin_m': 50, 'decel_cms2': 70, 'line_kmh': 160, 'speed_kmh': 10, 'warn_margin_kmh': 5, 'brake_margin_kmh': 10}, {'permitted': 0, 'action': 'warning'}), ('sampled regression 1', {'target_kmh': 0, 'distance_m': 0, 'safety_margin_m': 0, 'decel_cms2': 100, 'line_kmh': 160, 'speed_kmh': 139, 'warn_margin_kmh': 5, 'brake_margin_kmh': 15}, {'permitted': 0, 'action': 'brake'}), ('sampled regression 4', {'target_kmh': 0, 'distance_m': 100, 'safety_margin_m': 20, 'decel_cms2': 100, 'line_kmh': 80, 'speed_kmh': 136, 'warn_margin_kmh': 5, 'brake_margin_kmh': 15}, {'permitted': 45, 'action': 'brake'}), ('control 7', {'target_kmh': 40, 'distance_m': 2500, 'safety_margin_m': 20, 'decel_cms2': 50, 'line_kmh': 160, 'speed_kmh': 59, 'warn_margin_kmh': 3, 'brake_margin_kmh': 10}, {'permitted': 160, 'action': 'none'})], [('regression: fractional permitted speed', {'target_kmh': 20, 'distance_m': 100, 'safety_margin_m': 0, 'decel_cms2': 70, 'line_kmh': 160, 'speed_kmh': 60, 'warn_margin_kmh': 5, 'brake_margin_kmh': 10}, {'permitted': 47, 'action': 'brake'}), ('sampled regression 19', {'target_kmh': 0, 'distance_m': 40, 'safety_margin_m': 50, 'decel_cms2': 100, 'line_kmh': 160, 'speed_kmh': 17, 'warn_margin_kmh': 3, 'brake_margin_kmh': 15}, {'permitted': 0, 'action': 'brake'}), ('boundary: curve below line speed', {'target_kmh': 0, 'distance_m': 600, 'safety_margin_m': 50, 'decel_cms2': 70, 'line_kmh': 160, 'speed_kmh': 100, 'warn_margin_kmh': 5, 'brake_margin_kmh': 10}, {'permitted': 99, 'action': 'none'}), ('regression: curve above line speed', {'target_kmh': 0, 'distance_m': 2500, 'safety_margin_m': 50, 'decel_cms2': 70, 'line_kmh': 120, 'speed_kmh': 150, 'warn_margin_kmh': 5, 'brake_margin_kmh': 10}, {'permitted': 120, 'action': 'brake'}), ('boundary: warning boundary', {'target_kmh': 40, 'distance_m': 0, 'safety_margin_m': 50, 'decel_cms2': 70, 'line_kmh': 160, 'speed_kmh': 45, 'warn_margin_kmh': 5, 'brake_margin_kmh': 10}, {'permitted': 40, 'action': 'none'}), ('control 12', {'target_kmh': 40, 'distance_m': 600, 'safety_margin_m': 20, 'decel_cms2': 100, 'line_kmh': 160, 'speed_kmh': 133, 'warn_margin_kmh': 3, 'brake_margin_kmh': 15}, {'permitted': 128, 'action': 'warning'}), ('control 15', {'target_kmh': 0, 'distance_m': 600, 'safety_margin_m': 20, 'decel_cms2': 70, 'line_kmh': 160, 'speed_kmh': 43, 'warn_margin_kmh': 3, 'brake_margin_kmh': 10}, {'permitted': 102, 'action': 'none'}), ('control 18', {'target_kmh': 60, 'distance_m': 1200, 'safety_margin_m': 20, 'decel_cms2': 70, 'line_kmh': 120, 'speed_kmh': 6, 'warn_margin_kmh': 5, 'brake_margin_kmh': 10}, {'permitted': 120, 'action': 'none'})], [('regression: curve above line speed', {'target_kmh': 0, 'distance_m': 2500, 'safety_margin_m': 50, 'decel_cms2': 70, 'line_kmh': 120, 'speed_kmh': 150, 'warn_margin_kmh': 5, 'brake_margin_kmh': 10}, {'permitted': 120, 'action': 'brake'}), ('regression: fractional permitted speed', {'target_kmh': 20, 'distance_m': 100, 'safety_margin_m': 0, 'decel_cms2': 70, 'line_kmh': 160, 'speed_kmh': 60, 'warn_margin_kmh': 5, 'brake_margin_kmh': 10}, {'permitted': 47, 'action': 'brake'}), ('sampled regression 34', {'target_kmh': 0, 'distance_m': 0, 'safety_margin_m': 0, 'decel_cms2': 70, 'line_kmh': 120, 'speed_kmh': 96, 'warn_margin_kmh': 5, 'brake_margin_kmh': 15}, {'permitted': 0, 'action': 'brake'}), ('sampled regression 77', {'target_kmh': 40, 'distance_m': 40, 'safety_margin_m': 50, 'decel_cms2': 100, 'line_kmh': 80, 'speed_kmh': 51, 'warn_margin_kmh': 5, 'brake_margin_kmh': 8}, {'permitted': 40, 'action': 'brake'}), ('boundary: warning boundary', {'target_kmh': 40, 'distance_m': 0, 'safety_margin_m': 50, 'decel_cms2': 70, 'line_kmh': 160, 'speed_kmh': 45, 'warn_margin_kmh': 5, 'brake_margin_kmh': 10}, {'permitted': 40, 'action': 'none'}), ('control 23', {'target_kmh': 60, 'distance_m': 100, 'safety_margin_m': 50, 'decel_cms2': 70, 'line_kmh': 80, 'speed_kmh': 13, 'warn_margin_kmh': 5, 'brake_margin_kmh': 8}, {'permitted': 67, 'action': 'none'}), ('control 26', {'target_kmh': 60, 'distance_m': 2500, 'safety_margin_m': 50, 'decel_cms2': 70, 'line_kmh': 160, 'speed_kmh': 86, 'warn_margin_kmh': 3, 'brake_margin_kmh': 10}, {'permitted': 160, 'action': 'none'}), ('control 29', {'target_kmh': 0, 'distance_m': 250, 'safety_margin_m': 0, 'decel_cms2': 70, 'line_kmh': 120, 'speed_kmh': 4, 'warn_margin_kmh': 5, 'brake_margin_kmh': 10}, {'permitted': 67, 'action': 'none'})], [('regression: fractional permitted speed', {'target_kmh': 20, 'distance_m': 100, 'safety_margin_m': 0, 'decel_cms2': 70, 'line_kmh': 160, 'speed_kmh': 60, 'warn_margin_kmh': 5, 'brake_margin_kmh': 10}, {'permitted': 47, 'action': 'brake'}), ('sampled regression 46', {'target_kmh': 0, 'distance_m': 100, 'safety_margin_m': 20, 'decel_cms2': 100, 'line_kmh': 120, 'speed_kmh': 73, 'warn_margin_kmh': 5, 'brake_margin_kmh': 15}, {'permitted': 45, 'action': 'brake'}), ('sampled regression 19', {'target_kmh': 0, 'distance_m': 40, 'safety_margin_m': 50, 'decel_cms2': 100, 'line_kmh': 160, 'speed_kmh': 17, 'warn_margin_kmh': 3, 'brake_margin_kmh': 15}, {'permitted': 0, 'action': 'brake'}), ('boundary: between warning and brake', {'target_kmh': 40, 'distance_m': 0, 'safety_margin_m': 50, 'decel_cms2': 70, 'line_kmh': 160, 'speed_kmh': 48, 'warn_margin_kmh': 5, 'brake_margin_kmh': 10}, {'permitted': 40, 'action': 'warning'}), ('boundary: stop target inside the margin', {'target_kmh': 0, 'distance_m': 40, 'safety_margin_m': 50, 'decel_cms2': 70, 'line_kmh': 160, 'speed_kmh': 10, 'warn_margin_kmh': 5, 'brake_margin_kmh': 10}, {'permitted': 0, 'action': 'warning'}), ('sampled regression 34', {'target_kmh': 0, 'distance_m': 0, 'safety_margin_m': 0, 'decel_cms2': 70, 'line_kmh': 120, 'speed_kmh': 96, 'warn_margin_kmh': 5, 'brake_margin_kmh': 15}, {'permitted': 0, 'action': 'brake'}), ('sampled regression 37', {'target_kmh': 20, 'distance_m': 2500, 'safety_margin_m': 20, 'decel_cms2': 70, 'line_kmh': 80, 'speed_kmh': 168, 'warn_margin_kmh': 5, 'brake_margin_kmh': 10}, {'permitted': 80, 'action': 'brake'}), ('control 40', {'target_kmh': 0, 'distance_m': 600, 'safety_margin_m': 50, 'decel_cms2': 50, 'line_kmh': 160, 'speed_kmh': 70, 'warn_margin_kmh': 5, 'brake_margin_kmh': 15}, {'permitted': 84, 'action': 'none'})], [('regression: curve above line speed', {'target_kmh': 0, 'distance_m': 2500, 'safety_margin_m': 50, 'decel_cms2': 70, 'line_kmh': 120, 'speed_kmh': 150, 'warn_margin_kmh': 5, 'brake_margin_kmh': 10}, {'permitted': 120, 'action': 'brake'}), ('regression: fractional permitted speed', {'target_kmh': 20, 'distance_m': 100, 'safety_margin_m': 0, 'decel_cms2': 70, 'line_kmh': 160, 'speed_kmh': 60, 'warn_margin_kmh': 5, 'brake_margin_kmh': 10}, {'permitted': 47, 'action': 'brake'}), ('sampled regression 66', {'target_kmh': 0, 'distance_m': 100, 'safety_margin_m': 50, 'decel_cms2': 50, 'line_kmh': 80, 'speed_kmh': 140, 'warn_margin_kmh': 3, 'brake_margin_kmh': 15}, {'permitted': 25, 'action': 'brake'}), ('boundary: stop target inside the margin', {'target_kmh': 0, 'distance_m': 40, 'safety_margin_m': 50, 'decel_cms2': 70, 'line_kmh': 160, 'speed_kmh': 10, 'warn_margin_kmh': 5, 'brake_margin_kmh': 10}, {'permitted': 0, 'action': 'warning'}), ('boundary: target speed release', {'target_kmh': 40, 'distance_m': 0, 'safety_margin_m': 50, 'decel_cms2': 70, 'line_kmh': 160, 'speed_kmh': 44, 'warn_margin_kmh': 5, 'brake_margin_kmh': 10}, {'permitted': 40, 'action': 'none'}), ('sampled regression 45', {'target_kmh': 20, 'distance_m': 40, 'safety_margin_m': 50, 'decel_cms2': 70, 'line_kmh': 80, 'speed_kmh': 133, 'warn_margin_kmh': 5, 'brake_margin_kmh': 10}, {'permitted': 20, 'action': 'brake'}), ('control 48', {'target_kmh': 40, 'distance_m': 100, 'safety_margin_m': 20, 'decel_cms2': 100, 'line_kmh': 160, 'speed_kmh': 75, 'warn_margin_kmh': 3, 'brake_margin_kmh': 15}, {'permitted': 60, 'action': 'warning'}), ('control 51', {'target_kmh': 60, 'distance_m': 600, 'safety_margin_m': 0, 'decel_cms2': 50, 'line_kmh': 160, 'speed_kmh': 8, 'warn_margin_kmh': 5, 'brake_margin_kmh': 8}, {'permitted': 106, 'action': 'none'})]]\nfor label, args, expected in fixtures[N-1]:\n    check(label, solve(args), expected)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"}},"limitations":"Stipulated toy interlocking contract for a bounded teaching model; it makes no claim of conformance to any railway signalling standard and omits real safety cases. This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.","method":"Deterministic executable model with adversarial boundary fixtures.","provenance":{"created_by":"Failure Map","dependencies":"Python standard library","family":"w2-railway_interlocking_logic-atp-braking-curve-intervention-precedence","generated_at":"2026-09-29T14:47:49.445145+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Interlocking logic decides whether trains may be given authority; a wrong decision at this point either grants unsafe movements or strands traffic.","root_cause":"The warning test is evaluated first and shadows the brake intervention.","sha256":"e81aed925b6350e32edffcb288da164946b64d3128733f25c7853b4375291408","title":"ATP braking curve supervision: intervention precedence · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verified":true,"visibility":"public","verification":{"attempt":{"elapsed_ms":39.189,"exit_code":1,"observations":[{"actual":{"action":"brake","permitted":120},"check":"regression: curve above line speed","expected":{"action":"brake","permitted":120},"passed":true},{"actual":{"action":"warning","permitted":47},"check":"regression: fractional permitted speed","expected":{"action":"brake","permitted":47},"passed":false},{"actual":{"action":"brake","permitted":50},"check":"sampled regression 2","expected":{"action":"brake","permitted":50},"passed":true},{"actual":{"action":"warning","permitted":0},"check":"sampled regression 19","expected":{"action":"brake","permitted":0},"passed":false},{"actual":{"action":"warning","permitted":0},"check":"boundary: stop target inside the margin","expected":{"action":"warning","permitted":0},"passed":true},{"actual":{"action":"brake","permitted":0},"check":"sampled regression 1","expected":{"action":"brake","permitted":0},"passed":true},{"actual":{"action":"brake","permitted":45},"check":"sampled regression 4","expected":{"action":"brake","permitted":45},"passed":true},{"actual":{"action":"none","permitted":160},"check":"control 7","expected":{"action":"none","permitted":160},"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"regression: curve above line speed\", \"actual\": {\"permitted\": 120, \"action\": \"brake\"}, \"expected\": {\"permitted\": 120, \"action\": \"brake\"}, \"passed\": true}, {\"check\": \"regression: fractional permitted speed\", \"actual\": {\"permitted\": 47, \"action\": \"warning\"}, \"expected\": {\"permitted\": 47, \"action\": \"brake\"}, \"passed\": false}, {\"check\": \"sampled regression 2\", \"actual\": {\"permitted\": 50, \"action\": \"brake\"}, \"expected\": {\"permitted\": 50, \"action\": \"brake\"}, \"passed\": true}, {\"check\": \"sampled regression 19\", \"actual\": {\"permitted\": 0, \"action\": \"warning\"}, \"expected\": {\"permitted\": 0, \"action\": \"brake\"}, \"passed\": false}, {\"check\": \"boundary: stop target inside the margin\", \"actual\": {\"permitted\": 0, \"action\": \"warning\"}, \"expected\": {\"permitted\": 0, \"action\": \"warning\"}, \"passed\": true}, {\"check\": \"sampled regression 1\", \"actual\": {\"permitted\": 0, \"action\": \"brake\"}, \"expected\": {\"permitted\": 0, \"action\": \"brake\"}, \"passed\": true}, {\"check\": \"sampled regression 4\", \"actual\": {\"permitted\": 45, \"action\": \"brake\"}, \"expected\": {\"permitted\": 45, \"action\": \"brake\"}, \"passed\": true}, {\"check\": \"control 7\", \"actual\": {\"permitted\": 160, \"action\": \"none\"}, \"expected\": {\"permitted\": 160, \"action\": \"none\"}, \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":38.281,"exit_code":1,"observations":[{"actual":{"action":"warning","permitted":120},"check":"regression: curve above line speed","expected":{"action":"brake","permitted":120},"passed":false},{"actual":{"action":"warning","permitted":47},"check":"regression: fractional permitted speed","expected":{"action":"brake","permitted":47},"passed":false},{"actual":{"action":"warning","permitted":50},"check":"sampled regression 2","expected":{"action":"brake","permitted":50},"passed":false},{"actual":{"action":"warning","permitted":0},"check":"sampled regression 19","expected":{"action":"brake","permitted":0},"passed":false},{"actual":{"action":"warning","permitted":0},"check":"boundary: stop target inside the margin","expected":{"action":"warning","permitted":0},"passed":true},{"actual":{"action":"warning","permitted":0},"check":"sampled regression 1","expected":{"action":"brake","permitted":0},"passed":false},{"actual":{"action":"warning","permitted":45},"check":"sampled regression 4","expected":{"action":"brake","permitted":45},"passed":false},{"actual":{"action":"none","permitted":160},"check":"control 7","expected":{"action":"none","permitted":160},"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"regression: curve above line speed\", \"actual\": {\"permitted\": 120, \"action\": \"warning\"}, \"expected\": {\"permitted\": 120, \"action\": \"brake\"}, \"passed\": false}, {\"check\": \"regression: fractional permitted speed\", \"actual\": {\"permitted\": 47, \"action\": \"warning\"}, \"expected\": {\"permitted\": 47, \"action\": \"brake\"}, \"passed\": false}, {\"check\": \"sampled regression 2\", \"actual\": {\"permitted\": 50, \"action\": \"warning\"}, \"expected\": {\"permitted\": 50, \"action\": \"brake\"}, \"passed\": false}, {\"check\": \"sampled regression 19\", \"actual\": {\"permitted\": 0, \"action\": \"warning\"}, \"expected\": {\"permitted\": 0, \"action\": \"brake\"}, \"passed\": false}, {\"check\": \"boundary: stop target inside the margin\", \"actual\": {\"permitted\": 0, \"action\": \"warning\"}, \"expected\": {\"permitted\": 0, \"action\": \"warning\"}, \"passed\": true}, {\"check\": \"sampled regression 1\", \"actual\": {\"permitted\": 0, \"action\": \"warning\"}, \"expected\": {\"permitted\": 0, \"action\": \"brake\"}, \"passed\": false}, {\"check\": \"sampled regression 4\", \"actual\": {\"permitted\": 45, \"action\": \"warning\"}, \"expected\": {\"permitted\": 45, \"action\": \"brake\"}, \"passed\": false}, {\"check\": \"control 7\", \"actual\": {\"permitted\": 160, \"action\": \"none\"}, \"expected\": {\"permitted\": 160, \"action\": \"none\"}, \"passed\": true}], \"passed\": false}\n"}},"member_only":{"stages":["fixed"],"fields":["implementations.fixed","verification.fixed","harness","repair"],"note":"The verified repair, its recorded checks, the repair description, and the scoring harness are available to members."}}