Office of Railroad, Pipeline & Hazardous Materials Investigations Human Performance.
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Transcript of Office of Railroad, Pipeline & Hazardous Materials Investigations Human Performance.
![Page 1: Office of Railroad, Pipeline & Hazardous Materials Investigations Human Performance.](https://reader034.fdocuments.us/reader034/viewer/2022051316/5697bfbe1a28abf838ca2982/html5/thumbnails/1.jpg)
Office of Railroad, Pipeline & Hazardous Materials Investigations
Human PerformanceHuman Performance
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Train 703 Operator’s PerformanceTrain 703 Operator’s Performance
• Routine operations.
• Operating experience adequate.
• No drugs or alcohol.
• No use of cellular phone.
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Factors Affecting Operator AlertnessFactors Affecting Operator Alertness
• Medical fitness.
• Low task demands and unremarkable operating environment.
• Adequacy of sleep.
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Medical FitnessMedical Fitness
• GERD (acid reflux).
• Resultant sleep loss.
• Effects on operator alertness.
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Operating ConditionsOperating Conditions
• Low task demands.
• Unremarkable operating environment during rollback.
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ConclusionConclusion
The low task demands and unremarkable operating environment during the accident trip were conducive to the train operator becoming disengaged from some critical train operations.
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Acute Sleep LossAcute Sleep Loss
• Operator needed 8 hours sleep per night.
• Received a maximum of 5 hours uninterrupted sleep.
• 2 hr sleep loss results in significant alertness and performance decrement.
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ConclusionConclusion
The train operator’s alertness was likely reduced due to inadequate sleep.
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Opportunity for SleepOpportunity for Sleep
• He had 9 hrs off duty.
• Commute time and basic needs result in less than 7 hrs to sleep.
• 8 hrs sleep, on average, is needed.
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Train Operator Work and Rest ScheduleTrain Operator Work and Rest Schedule
Time
S u M Tu W Th F S a S u M Tu W Th F S a S u M Tu W Th F S a S u M Tu W Th F S a S u M Tu W
0000
0200
0400
0600
0800
1000
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1400
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2200
O vertim e S hift Regular S hift
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Train Operator Work and Rest ScheduleTrain Operator Work and Rest Schedule
Time
S u M Tu W Th F S a S u M Tu W Th F S a S u M Tu W Th F S a S u M Tu W Th F S a S u M Tu W
0000
0200
0400
0600
0800
1000
1200
1400
1600
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2200
O vertim e S hift Regular S hift O ff Duty
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ConclusionConclusion
WMATA’s practice of allowing train operators to return to work after having as few as 8 hours off between shifts following prolonged tours of duty does not give train operators the opportunity to receive adequate sleep to be fully alert and to operate safely.
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Regulations Regulations • FTA has no hours-of-service regulations.
• Each transit agency develops its own on-duty/off-duty policy.
• Transit industry survey.
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