{"abstract":"Line clear is given while the clearing point beyond the home signal is fouled.","category":"Railway interlocking logic","checks":8,"contract":"A block section between two boxes is normal, line_clear or train_on_line. An offer is accepted (line_clear) only from normal with the clearing point clear, otherwise alarm refused. A departure without line clear raises unauthorised-departure; any departure puts the train on line. arrive_complete returns train_on_line to normal; arrive_no_tail raises tail-missing and keeps the block occupied. cancel only withdraws line_clear. cp_blocked/cp_clear set the clearing point.","contract_signature":"x","evaluation_group":"w2-railway_interlocking_logic-absolute-block","failed_approach":"Allowing re-acceptance from line_clear silently swallows a duplicate offer that should be refused.","family":"w2-railway_interlocking_logic-absolute-block-clearing-point-condition","id":"FA-67041","implementations":{"attempt":{"sha256":"5c98dcc52b2bedd402847b42edc24d464d853f0a397008bda78509551d7b3cca","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(x):\n    state = 'normal'\n    cp = True\n    alarms = []\n    for ev in x['events']:\n        if ev == 'cp_blocked':\n            cp = False\n        elif ev == 'cp_clear':\n            cp = True\n        elif ev == 'offer':\n            if state != 'train_on_line' and cp:\n                state = 'line_clear'\n            else:\n                alarms.append('refused')\n        elif ev == 'depart':\n            if state != 'line_clear':\n                alarms.append('unauthorised-departure')\n            state = 'train_on_line'\n        elif ev == 'arrive_complete':\n            if state == 'train_on_line':\n                state = 'normal'\n        elif ev == 'arrive_no_tail':\n            alarms.append('tail-missing')\n        elif ev == 'cancel':\n            if state == 'line_clear':\n                state = 'normal'\n    return {'state': state, 'alarms': alarms}\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[('sampled regression 10', {'events': ['arrive_complete', 'cp_blocked', 'offer', 'arrive_complete', 'depart']}, {'state': 'train_on_line', 'alarms': ['refused', 'unauthorised-departure']}), ('boundary: second offer while line clear', {'events': ['offer', 'offer']}, {'state': 'line_clear', 'alarms': ['refused']}), ('sampled regression 45', {'events': ['depart', 'depart', 'depart', 'cp_blocked', 'depart', 'offer', 'arrive_complete', 'offer']}, {'state': 'normal', 'alarms': ['unauthorised-departure', 'unauthorised-departure', 'unauthorised-departure', 'unauthorised-departure', 'refused', 'refused']}), ('control 4', {'events': ['cancel', 'arrive_no_tail', 'offer', 'offer', 'depart', 'arrive_no_tail']}, {'state': 'train_on_line', 'alarms': ['tail-missing', 'refused', 'tail-missing']}), ('boundary: offer with clearing point fouled', {'events': ['cp_blocked', 'offer', 'cp_clear', 'offer']}, {'state': 'line_clear', 'alarms': ['refused']}), ('control 1', {'events': ['cp_blocked', 'depart', 'arrive_no_tail', 'cp_clear', 'depart']}, {'state': 'train_on_line', 'alarms': ['unauthorised-departure', 'tail-missing', 'unauthorised-departure']}), ('control 7', {'events': ['offer', 'arrive_no_tail', 'arrive_complete', 'cp_clear', 'cp_clear', 'arrive_no_tail']}, {'state': 'line_clear', 'alarms': ['tail-missing', 'tail-missing']}), ('control 13', {'events': ['depart', 'offer', 'arrive_complete', 'arrive_complete', 'cp_blocked', 'cp_clear', 'depart']}, {'state': 'train_on_line', 'alarms': ['unauthorised-departure', 'refused', 'unauthorised-departure']})], [('sampled regression 33', {'events': ['arrive_no_tail', 'cp_blocked', 'arrive_complete', 'offer']}, {'state': 'normal', 'alarms': ['tail-missing', 'refused']}), ('boundary: second offer while line clear', {'events': ['offer', 'offer']}, {'state': 'line_clear', 'alarms': ['refused']}), ('sampled regression 76', {'events': ['offer', 'offer', 'cp_blocked', 'cancel', 'cp_blocked', 'cp_blocked', 'cp_blocked', 'offer']}, {'state': 'normal', 'alarms': ['refused', 'refused']}), ('control 46', {'events': ['offer', 'offer', 'arrive_complete', 'arrive_no_tail', 'cp_clear', 'arrive_complete', 'cancel', 'arrive_no_tail', 'offer', 'arrive_no_tail']}, {'state': 'line_clear', 'alarms': ['refused', 'tail-missing', 'tail-missing', 'tail-missing']}), ('boundary: second train into occupied block', {'events': ['offer', 'depart', 'depart']}, {'state': 'train_on_line', 'alarms': ['unauthorised-departure']}), ('control 12', {'events': ['depart', 'cp_clear', 'arrive_complete', 'depart', 'cp_blocked']}, {'state': 'train_on_line', 'alarms': ['unauthorised-departure', 'unauthorised-departure']}), ('control 15', {'events': ['arrive_complete', 'cp_clear', 'cancel']}, {'state': 'normal', 'alarms': []}), ('control 18', {'events': ['cp_clear', 'depart', 'offer', 'cp_blocked']}, {'state': 'train_on_line', 'alarms': ['unauthorised-departure', 'refused']})], [('sampled regression 36', {'events': ['cp_blocked', 'cp_blocked', 'offer']}, {'state': 'normal', 'alarms': ['refused']}), ('boundary: second offer while line clear', {'events': ['offer', 'offer']}, {'state': 'line_clear', 'alarms': ['refused']}), ('sampled regression 53', {'events': ['offer', 'offer', 'arrive_complete', 'arrive_complete', 'offer', 'cancel', 'cancel', 'cp_blocked', 'arrive_no_tail', 'offer']}, {'state': 'normal', 'alarms': ['refused', 'refused', 'tail-missing', 'refused']}), ('control 69', {'events': ['offer', 'offer', 'offer']}, {'state': 'line_clear', 'alarms': ['refused', 'refused']}), ('boundary: train arrives without tail lamp', {'events': ['offer', 'depart', 'arrive_no_tail', 'offer']}, {'state': 'train_on_line', 'alarms': ['tail-missing', 'refused']}), ('control 23', {'events': ['depart', 'cp_blocked', 'arrive_no_tail', 'offer', 'cp_clear']}, {'state': 'train_on_line', 'alarms': ['unauthorised-departure', 'tail-missing', 'refused']}), ('control 26', {'events': ['cp_clear', 'offer', 'cp_clear', 'cp_clear', 'cp_blocked', 'cp_clear', 'cp_blocked', 'depart']}, {'state': 'train_on_line', 'alarms': []}), ('control 29', {'events': ['arrive_complete', 'depart', 'offer', 'depart', 'arrive_complete', 'arrive_no_tail', 'cp_clear']}, {'state': 'normal', 'alarms': ['unauthorised-departure', 'refused', 'unauthorised-departure', 'tail-missing']})], [('sampled regression 45', {'events': ['depart', 'depart', 'depart', 'cp_blocked', 'depart', 'offer', 'arrive_complete', 'offer']}, {'state': 'normal', 'alarms': ['unauthorised-departure', 'unauthorised-departure', 'unauthorised-departure', 'unauthorised-departure', 'refused', 'refused']}), ('boundary: second offer while line clear', {'events': ['offer', 'offer']}, {'state': 'line_clear', 'alarms': ['refused']}), ('sampled regression 36', {'events': ['cp_blocked', 'cp_blocked', 'offer']}, {'state': 'normal', 'alarms': ['refused']}), ('control 11', {'events': ['arrive_no_tail', 'offer', 'offer', 'arrive_complete', 'cancel', 'arrive_no_tail', 'depart', 'cp_blocked', 'cp_clear']}, {'state': 'train_on_line', 'alarms': ['tail-missing', 'refused', 'tail-missing', 'unauthorised-departure']}), ('boundary: cancel of line clear', {'events': ['offer', 'cancel', 'offer']}, {'state': 'line_clear', 'alarms': []}), ('control 34', {'events': ['cp_blocked', 'arrive_no_tail', 'cancel', 'cp_clear', 'offer', 'arrive_complete', 'cp_blocked']}, {'state': 'line_clear', 'alarms': ['tail-missing']}), ('control 37', {'events': ['offer', 'depart', 'cp_clear', 'cp_clear']}, {'state': 'train_on_line', 'alarms': []}), ('control 40', {'events': ['arrive_complete', 'cp_clear', 'arrive_no_tail']}, {'state': 'normal', 'alarms': ['tail-missing']})], [('sampled regression 51', {'events': ['cp_clear', 'cp_blocked', 'offer']}, {'state': 'normal', 'alarms': ['refused']}), ('boundary: second offer while line clear', {'events': ['offer', 'offer']}, {'state': 'line_clear', 'alarms': ['refused']}), ('sampled regression 72', {'events': ['offer', 'depart', 'arrive_complete', 'cp_blocked', 'offer', 'offer', 'arrive_no_tail', 'cancel']}, {'state': 'normal', 'alarms': ['refused', 'refused', 'tail-missing']}), ('control 49', {'events': ['offer', 'cp_clear', 'offer', 'arrive_no_tail']}, {'state': 'line_clear', 'alarms': ['refused', 'tail-missing']}), ('boundary: offer with clearing point fouled', {'events': ['cp_blocked', 'offer', 'cp_clear', 'offer']}, {'state': 'line_clear', 'alarms': ['refused']}), ('sampled regression 45', {'events': ['depart', 'depart', 'depart', 'cp_blocked', 'depart', 'offer', 'arrive_complete', 'offer']}, {'state': 'normal', 'alarms': ['unauthorised-departure', 'unauthorised-departure', 'unauthorised-departure', 'unauthorised-departure', 'refused', 'refused']}), ('control 48', {'events': ['cp_clear', 'cp_blocked', 'arrive_no_tail', 'depart', 'offer', 'offer', 'arrive_no_tail', 'offer']}, {'state': 'train_on_line', 'alarms': ['tail-missing', 'unauthorised-departure', 'refused', 'refused', 'tail-missing', 'refused']}), ('control 54', {'events': ['offer', 'arrive_no_tail', 'offer', 'depart', 'arrive_complete', 'offer', 'cp_blocked']}, {'state': 'line_clear', 'alarms': ['tail-missing', 'refused']})]]\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":"8d523ad0f309c6052dce42567df0af69f490491a0435f9018c9094a25b0e25ec","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(x):\n    state = 'normal'\n    cp = True\n    alarms = []\n    for ev in x['events']:\n        if ev == 'cp_blocked':\n            cp = False\n        elif ev == 'cp_clear':\n            cp = True\n        elif ev == 'offer':\n            if state == 'normal':\n                state = 'line_clear'\n            else:\n                alarms.append('refused')\n        elif ev == 'depart':\n            if state != 'line_clear':\n                alarms.append('unauthorised-departure')\n            state = 'train_on_line'\n        elif ev == 'arrive_complete':\n            if state == 'train_on_line':\n                state = 'normal'\n        elif ev == 'arrive_no_tail':\n            alarms.append('tail-missing')\n        elif ev == 'cancel':\n            if state == 'line_clear':\n                state = 'normal'\n    return {'state': state, 'alarms': alarms}\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[('sampled regression 10', {'events': ['arrive_complete', 'cp_blocked', 'offer', 'arrive_complete', 'depart']}, {'state': 'train_on_line', 'alarms': ['refused', 'unauthorised-departure']}), ('boundary: second offer while line clear', {'events': ['offer', 'offer']}, {'state': 'line_clear', 'alarms': ['refused']}), ('sampled regression 45', {'events': ['depart', 'depart', 'depart', 'cp_blocked', 'depart', 'offer', 'arrive_complete', 'offer']}, {'state': 'normal', 'alarms': ['unauthorised-departure', 'unauthorised-departure', 'unauthorised-departure', 'unauthorised-departure', 'refused', 'refused']}), ('control 4', {'events': ['cancel', 'arrive_no_tail', 'offer', 'offer', 'depart', 'arrive_no_tail']}, {'state': 'train_on_line', 'alarms': ['tail-missing', 'refused', 'tail-missing']}), ('boundary: offer with clearing point fouled', {'events': ['cp_blocked', 'offer', 'cp_clear', 'offer']}, {'state': 'line_clear', 'alarms': ['refused']}), ('control 1', {'events': ['cp_blocked', 'depart', 'arrive_no_tail', 'cp_clear', 'depart']}, {'state': 'train_on_line', 'alarms': ['unauthorised-departure', 'tail-missing', 'unauthorised-departure']}), ('control 7', {'events': ['offer', 'arrive_no_tail', 'arrive_complete', 'cp_clear', 'cp_clear', 'arrive_no_tail']}, {'state': 'line_clear', 'alarms': ['tail-missing', 'tail-missing']}), ('control 13', {'events': ['depart', 'offer', 'arrive_complete', 'arrive_complete', 'cp_blocked', 'cp_clear', 'depart']}, {'state': 'train_on_line', 'alarms': ['unauthorised-departure', 'refused', 'unauthorised-departure']})], [('sampled regression 33', {'events': ['arrive_no_tail', 'cp_blocked', 'arrive_complete', 'offer']}, {'state': 'normal', 'alarms': ['tail-missing', 'refused']}), ('boundary: second offer while line clear', {'events': ['offer', 'offer']}, {'state': 'line_clear', 'alarms': ['refused']}), ('sampled regression 76', {'events': ['offer', 'offer', 'cp_blocked', 'cancel', 'cp_blocked', 'cp_blocked', 'cp_blocked', 'offer']}, {'state': 'normal', 'alarms': ['refused', 'refused']}), ('control 46', {'events': ['offer', 'offer', 'arrive_complete', 'arrive_no_tail', 'cp_clear', 'arrive_complete', 'cancel', 'arrive_no_tail', 'offer', 'arrive_no_tail']}, {'state': 'line_clear', 'alarms': ['refused', 'tail-missing', 'tail-missing', 'tail-missing']}), ('boundary: second train into occupied block', {'events': ['offer', 'depart', 'depart']}, {'state': 'train_on_line', 'alarms': ['unauthorised-departure']}), ('control 12', {'events': ['depart', 'cp_clear', 'arrive_complete', 'depart', 'cp_blocked']}, {'state': 'train_on_line', 'alarms': ['unauthorised-departure', 'unauthorised-departure']}), ('control 15', {'events': ['arrive_complete', 'cp_clear', 'cancel']}, {'state': 'normal', 'alarms': []}), ('control 18', {'events': ['cp_clear', 'depart', 'offer', 'cp_blocked']}, {'state': 'train_on_line', 'alarms': ['unauthorised-departure', 'refused']})], [('sampled regression 36', {'events': ['cp_blocked', 'cp_blocked', 'offer']}, {'state': 'normal', 'alarms': ['refused']}), ('boundary: second offer while line clear', {'events': ['offer', 'offer']}, {'state': 'line_clear', 'alarms': ['refused']}), ('sampled regression 53', {'events': ['offer', 'offer', 'arrive_complete', 'arrive_complete', 'offer', 'cancel', 'cancel', 'cp_blocked', 'arrive_no_tail', 'offer']}, {'state': 'normal', 'alarms': ['refused', 'refused', 'tail-missing', 'refused']}), ('control 69', {'events': ['offer', 'offer', 'offer']}, {'state': 'line_clear', 'alarms': ['refused', 'refused']}), ('boundary: train arrives without tail lamp', {'events': ['offer', 'depart', 'arrive_no_tail', 'offer']}, {'state': 'train_on_line', 'alarms': ['tail-missing', 'refused']}), ('control 23', {'events': ['depart', 'cp_blocked', 'arrive_no_tail', 'offer', 'cp_clear']}, {'state': 'train_on_line', 'alarms': ['unauthorised-departure', 'tail-missing', 'refused']}), ('control 26', {'events': ['cp_clear', 'offer', 'cp_clear', 'cp_clear', 'cp_blocked', 'cp_clear', 'cp_blocked', 'depart']}, {'state': 'train_on_line', 'alarms': []}), ('control 29', {'events': ['arrive_complete', 'depart', 'offer', 'depart', 'arrive_complete', 'arrive_no_tail', 'cp_clear']}, {'state': 'normal', 'alarms': ['unauthorised-departure', 'refused', 'unauthorised-departure', 'tail-missing']})], [('sampled regression 45', {'events': ['depart', 'depart', 'depart', 'cp_blocked', 'depart', 'offer', 'arrive_complete', 'offer']}, {'state': 'normal', 'alarms': ['unauthorised-departure', 'unauthorised-departure', 'unauthorised-departure', 'unauthorised-departure', 'refused', 'refused']}), ('boundary: second offer while line clear', {'events': ['offer', 'offer']}, {'state': 'line_clear', 'alarms': ['refused']}), ('sampled regression 36', {'events': ['cp_blocked', 'cp_blocked', 'offer']}, {'state': 'normal', 'alarms': ['refused']}), ('control 11', {'events': ['arrive_no_tail', 'offer', 'offer', 'arrive_complete', 'cancel', 'arrive_no_tail', 'depart', 'cp_blocked', 'cp_clear']}, {'state': 'train_on_line', 'alarms': ['tail-missing', 'refused', 'tail-missing', 'unauthorised-departure']}), ('boundary: cancel of line clear', {'events': ['offer', 'cancel', 'offer']}, {'state': 'line_clear', 'alarms': []}), ('control 34', {'events': ['cp_blocked', 'arrive_no_tail', 'cancel', 'cp_clear', 'offer', 'arrive_complete', 'cp_blocked']}, {'state': 'line_clear', 'alarms': ['tail-missing']}), ('control 37', {'events': ['offer', 'depart', 'cp_clear', 'cp_clear']}, {'state': 'train_on_line', 'alarms': []}), ('control 40', {'events': ['arrive_complete', 'cp_clear', 'arrive_no_tail']}, {'state': 'normal', 'alarms': ['tail-missing']})], [('sampled regression 51', {'events': ['cp_clear', 'cp_blocked', 'offer']}, {'state': 'normal', 'alarms': ['refused']}), ('boundary: second offer while line clear', {'events': ['offer', 'offer']}, {'state': 'line_clear', 'alarms': ['refused']}), ('sampled regression 72', {'events': ['offer', 'depart', 'arrive_complete', 'cp_blocked', 'offer', 'offer', 'arrive_no_tail', 'cancel']}, {'state': 'normal', 'alarms': ['refused', 'refused', 'tail-missing']}), ('control 49', {'events': ['offer', 'cp_clear', 'offer', 'arrive_no_tail']}, {'state': 'line_clear', 'alarms': ['refused', 'tail-missing']}), ('boundary: offer with clearing point fouled', {'events': ['cp_blocked', 'offer', 'cp_clear', 'offer']}, {'state': 'line_clear', 'alarms': ['refused']}), ('sampled regression 45', {'events': ['depart', 'depart', 'depart', 'cp_blocked', 'depart', 'offer', 'arrive_complete', 'offer']}, {'state': 'normal', 'alarms': ['unauthorised-departure', 'unauthorised-departure', 'unauthorised-departure', 'unauthorised-departure', 'refused', 'refused']}), ('control 48', {'events': ['cp_clear', 'cp_blocked', 'arrive_no_tail', 'depart', 'offer', 'offer', 'arrive_no_tail', 'offer']}, {'state': 'train_on_line', 'alarms': ['tail-missing', 'unauthorised-departure', 'refused', 'refused', 'tail-missing', 'refused']}), ('control 54', {'events': ['offer', 'arrive_no_tail', 'offer', 'depart', 'arrive_complete', 'offer', 'cp_blocked']}, {'state': 'line_clear', 'alarms': ['tail-missing', 'refused']})]]\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-absolute-block-clearing-point-condition","generated_at":"2026-09-29T14:47:49.273932+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 acceptance ignores the clearing point.","sha256":"dde227a69e95c98c54989a4d21dcaee6039e26954eb8dbd53d2aa6735b0cb802","title":"Absolute block bell-code working: clearing point condition · 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":42.349,"exit_code":1,"observations":[{"actual":{"alarms":["refused","unauthorised-departure"],"state":"train_on_line"},"check":"sampled regression 10","expected":{"alarms":["refused","unauthorised-departure"],"state":"train_on_line"},"passed":true},{"actual":{"alarms":[],"state":"line_clear"},"check":"boundary: second offer while line clear","expected":{"alarms":["refused"],"state":"line_clear"},"passed":false},{"actual":{"alarms":["unauthorised-departure","unauthorised-departure","unauthorised-departure","unauthorised-departure","refused","refused"],"state":"normal"},"check":"sampled regression 45","expected":{"alarms":["unauthorised-departure","unauthorised-departure","unauthorised-departure","unauthorised-departure","refused","refused"],"state":"normal"},"passed":true},{"actual":{"alarms":["tail-missing","tail-missing"],"state":"train_on_line"},"check":"control 4","expected":{"alarms":["tail-missing","refused","tail-missing"],"state":"train_on_line"},"passed":false},{"actual":{"alarms":["refused"],"state":"line_clear"},"check":"boundary: offer with clearing point fouled","expected":{"alarms":["refused"],"state":"line_clear"},"passed":true},{"actual":{"alarms":["unauthorised-departure","tail-missing","unauthorised-departure"],"state":"train_on_line"},"check":"control 1","expected":{"alarms":["unauthorised-departure","tail-missing","unauthorised-departure"],"state":"train_on_line"},"passed":true},{"actual":{"alarms":["tail-missing","tail-missing"],"state":"line_clear"},"check":"control 7","expected":{"alarms":["tail-missing","tail-missing"],"state":"line_clear"},"passed":true},{"actual":{"alarms":["unauthorised-departure","refused","unauthorised-departure"],"state":"train_on_line"},"check":"control 13","expected":{"alarms":["unauthorised-departure","refused","unauthorised-departure"],"state":"train_on_line"},"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"sampled regression 10\", \"actual\": {\"state\": \"train_on_line\", \"alarms\": [\"refused\", \"unauthorised-departure\"]}, \"expected\": {\"state\": \"train_on_line\", \"alarms\": [\"refused\", \"unauthorised-departure\"]}, \"passed\": true}, {\"check\": \"boundary: second offer while line clear\", \"actual\": {\"state\": \"line_clear\", \"alarms\": []}, \"expected\": {\"state\": \"line_clear\", \"alarms\": [\"refused\"]}, \"passed\": false}, {\"check\": \"sampled regression 45\", \"actual\": {\"state\": \"normal\", \"alarms\": [\"unauthorised-departure\", \"unauthorised-departure\", \"unauthorised-departure\", \"unauthorised-departure\", \"refused\", \"refused\"]}, \"expected\": {\"state\": \"normal\", \"alarms\": [\"unauthorised-departure\", \"unauthorised-departure\", \"unauthorised-departure\", \"unauthorised-departure\", \"refused\", \"refused\"]}, \"passed\": true}, {\"check\": \"control 4\", \"actual\": {\"state\": \"train_on_line\", \"alarms\": [\"tail-missing\", \"tail-missing\"]}, \"expected\": {\"state\": \"train_on_line\", \"alarms\": [\"tail-missing\", \"refused\", \"tail-missing\"]}, \"passed\": false}, {\"check\": \"boundary: offer with clearing point fouled\", \"actual\": {\"state\": \"line_clear\", \"alarms\": [\"refused\"]}, \"expected\": {\"state\": \"line_clear\", \"alarms\": [\"refused\"]}, \"passed\": true}, {\"check\": \"control 1\", \"actual\": {\"state\": \"train_on_line\", \"alarms\": [\"unauthorised-departure\", \"tail-missing\", \"unauthorised-departure\"]}, \"expected\": {\"state\": \"train_on_line\", \"alarms\": [\"unauthorised-departure\", \"tail-missing\", \"unauthorised-departure\"]}, \"passed\": true}, {\"check\": \"control 7\", \"actual\": {\"state\": \"line_clear\", \"alarms\": [\"tail-missing\", \"tail-missing\"]}, \"expected\": {\"state\": \"line_clear\", \"alarms\": [\"tail-missing\", \"tail-missing\"]}, \"passed\": true}, {\"check\": \"control 13\", \"actual\": {\"state\": \"train_on_line\", \"alarms\": [\"unauthorised-departure\", \"refused\", \"unauthorised-departure\"]}, \"expected\": {\"state\": \"train_on_line\", \"alarms\": [\"unauthorised-departure\", \"refused\", \"unauthorised-departure\"]}, \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":38.575,"exit_code":1,"observations":[{"actual":{"alarms":[],"state":"train_on_line"},"check":"sampled regression 10","expected":{"alarms":["refused","unauthorised-departure"],"state":"train_on_line"},"passed":false},{"actual":{"alarms":["refused"],"state":"line_clear"},"check":"boundary: second offer while line clear","expected":{"alarms":["refused"],"state":"line_clear"},"passed":true},{"actual":{"alarms":["unauthorised-departure","unauthorised-departure","unauthorised-departure","unauthorised-departure","refused"],"state":"line_clear"},"check":"sampled regression 45","expected":{"alarms":["unauthorised-departure","unauthorised-departure","unauthorised-departure","unauthorised-departure","refused","refused"],"state":"normal"},"passed":false},{"actual":{"alarms":["tail-missing","refused","tail-missing"],"state":"train_on_line"},"check":"control 4","expected":{"alarms":["tail-missing","refused","tail-missing"],"state":"train_on_line"},"passed":true},{"actual":{"alarms":["refused"],"state":"line_clear"},"check":"boundary: offer with clearing point fouled","expected":{"alarms":["refused"],"state":"line_clear"},"passed":true},{"actual":{"alarms":["unauthorised-departure","tail-missing","unauthorised-departure"],"state":"train_on_line"},"check":"control 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