Railways Train Troubleshooting 150 Problems — real-world interview & field troubleshooting questions with clear, practical answers. Tap any question to open its answer. Showing the first 70 questions free. The complete 150-question set is available as a PDF below. Locomotive Start-Up & Control Faults Q1 A locomotive has no response when the start command is given. What would you check first? Answer I would check battery or low-voltage supply, control-circuit fuses, emergency-stop status, key or master-controller position, interlocks, and active fault indications. I would verify each start permissive in sequence rather than replacing parts at random. Q2 The locomotive control desk is powered, but the traction system will not enable. What could be wrong? Answer Possible causes include an active safety interlock, brake not released, direction selector not accepted, circuit breaker open, low control voltage, or a stored propulsion fault. I would read the diagnostic log a...