What should a crew do if they detect flat spots while moving?

When a crew detects flat spots on the wheels while moving, the appropriate course of action is to set the locomotive out at the next available location. This is essential because flat spots on wheels can indicate that there is a significant underlying issue that may affect the safety and operational integrity of the train. Continuing to operate the locomotive with flat spots could exacerbate the problem, potentially leading to further damage to the wheels and the rail infrastructure, as well as posing a safety risk to the crew and any passengers.

By choosing to set the locomotive out, the crew takes a proactive step to mitigate risks. This allows maintenance crews to inspect the train and perform necessary repairs or assessments without compromising safety. Addressing such mechanical issues promptly is a critical part of railway operations to ensure that equipment is functioning correctly and safely.

Continuing to operate the train, even to assess the severity of the flat spots, is not advisable because it could lead to more significant problems, both mechanically and operationally. Thus, taking the train out of service as soon as a flat spot is detected reflects adherence to safety protocols and maintenance best practices.