BNSF Air Brake and Train Handling Practice Test

The correct procedure for a proper split reduction for planned slowdowns involves making an initial reduction to a range of 6 to 8 psi, followed by increments of 2 to 3 psi spaced 30 seconds apart. This method allows for gradual deceleration of the train, ensuring smooth and safe operation while maintaining control over the train's speed.

By starting with an initial reduction in the specified psi range, the engineer can gauge the train's response and adjust the braking pressure accordingly. The subsequent gradual increments provide a controlled approach to slowing down, allowing time for the air brake system to adjust and respond effectively. This technique is particularly important in avoiding abrupt changes in speed that could affect the handling of the train, reduce the risk of wheel slip, and improve passenger comfort.

The emphasis on spacing the increments at 30-second intervals is also crucial, as it enables the train’s momentum to be managed efficiently and ensures safety while accommodating the dynamics of the train as it slows.