Normal Direction of Travel

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Summary: The Normal Direction of Travel or NDOT determines the direction and operation of lighting. It is Bit 0 of CV29 and is usually set to 0 (Off).

The Normal Direction of Travel is configured with CV 29. Changing CV 29 (Bit 0, Direction) will reverse both the locomotive's direction of travel and its lighting effects. [1]

Early diesel locomotives were constructed with the cab at the front (cab/carbody units), such as the EMD/GMD F and E series, the ALCO PA/FA, and FM's C-Liners. With the appearance of the hood units (ALCO's RS series, EMD/GMD GPs or FM's HH series such as the Train Master), many railroads opted to run them long hood forward, with the engineer and fireman in the cab toward the rear, like a steam locomotive, for crew safety. Later many were converted to short hood forward for better visibility.

If the motor was mis-wired resulting in the wrong direction of travel, the proper solution is to reverse the wires. The Direction bit may be used for something else, and altering it unnecessarily could create problems later.

  1. S-9.2.2: This bit controls the locomotive's forward and backward direction in digital mode only. Directional sensitive functions, such as headlights (FL and FR), will also be reversed so that they line up with the locomotive’s new forward direction.