Why is it important to limit speed to 10 MPH for locomotives with significant flat spots?

Limiting the speed of locomotives with significant flat spots to 10 MPH is crucial for ensuring safety until repairs are made. Flat spots can lead to uneven wheel surfaces, which can create abrupt lateral forces during movement. This increases the risk of instability and potential safety hazards, both for the locomotive itself and for the train as a whole. By restricting the speed, operators can minimize these risks and maintain a manageable level of control, allowing for safer operation until the wheels can be repaired or replaced. Ensuring that the train operates within this safe speed threshold is vital to protect not only the equipment but also the crew and others on or near the railway.

While other aspects such as overheating, derailment concerns, and wear on traction motors are relevant considerations, the primary focus with significant flat spots is on safety during operation.