If a flat spot is found in excess of 2.5 inches, but less than 4 inches the train must not exceed?

If a flat spot is found in excess of 2.5 inches, but less than 4 inches the train must not exceed?

• A. 10 MPH and a report must be made promptly to the Dispatcher
• B. 20 MPH
• C. 5 MPH
• D. 15 MPH

Answer: (A)

When a wheel has a flat spot in the range of more than 2.5 inches but less than 4 inches, the train must be operated no faster than 10 mph and the condition must be reported to the Dispatcher. A flat wheel spot this size reduces wheel-rail contact and can cause rough rides, wheel damage, or derailment at higher speeds, so a strict slow-speed movement is required while the issue is addressed. The crew slows to 10 mph and contacts the Dispatcher to arrange for inspection or repair, ensuring the defective wheel is managed safely before continuing. The other speeds listed would not provide the mandated safeguard for this defect size, which is why they aren’t the appropriate action here.

When a wheel has a flat spot in the range of more than 2.5 inches but less than 4 inches, the train must be operated no faster than 10 mph and the condition must be reported to the Dispatcher. A flat wheel spot this size reduces wheel-rail contact and can cause rough rides, wheel damage, or derailment at higher speeds, so a strict slow-speed movement is required while the issue is addressed. The crew slows to 10 mph and contacts the Dispatcher to arrange for inspection or repair, ensuring the defective wheel is managed safely before continuing. The other speeds listed would not provide the mandated safeguard for this defect size, which is why they aren’t the appropriate action here.