What is the preferred option when cutting out dynamic brakes on locomotives to comply with axle limitations?

The preferred option for cutting out dynamic brakes on locomotives to comply with axle limitations is to cut out the basic range dynamic brake on trailing locomotives. This approach allows for the most efficient management of braking capabilities while adhering to safety regulations associated with axle loading and braking performance.

By focusing on the trailing locomotives, the integrity of the lead locomotive's braking system remains intact, thereby ensuring that overall braking effectiveness is maintained where it is most needed. This method aligns with the operational requirements and minimizes potential issues that could arise from completely removing the dynamic brake systems, which could compromise train handling and safety.

Other options may introduce complications or inadequate safety measures. For instance, removing the entire dynamic brake system disrupts the train's ability to manage speed effectively and may make it challenging to control the train, especially on descents. Limiting passenger cars to one dynamic brake could lead to insufficient braking power in emergency situations. Reducing speed significantly may enhance safety in some circumstances but does not specifically address compliance with axle limitations as effectively as cutting out the dynamic brakes on trailing locomotives.