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This is from the MTH service manual. Should be mentioned in the instruction manual also:

Reverse Unit Lockout.  ProtoSound equipped engine can have their reversing sequence locked into a single direction (Forward, Neutral or Reverse), so that whenever power is applied to the track, the engine will always run in the same direction.  This is very useful for automatically or time controlled layouts.  In order to lock out and engine, the feature must first be enabled by using Reset Feature 40 (described below).  Once enabled, the following sequence is used to lock the engine. Cycle the engine into the desired directional state, and set the throttle to 8V AC. Press and hold the Whistle control.  In Forward or Reverse, the whistle or horn will be sounding.  In Neutral, the bell will begin to ring. Without releasing the Whistle control, bring the throttle to the OFF position (0V AC on the track).  Once power is off, release the Whistle control. After 2 seconds, a short whistle/horn blast will be heard.  Immediately turn power to the track on.  The engine will remain in the directional state it was last in.  The unit is now locked out.

The engine can be unlocked by following a similar procedure: 1.  Set the throttle to 8V AC. 2.  Press and hold the Whistle control.  In Forward or Reverse, the whistle or horn will be sounding.  In Neutral, the bell will begin to ring. 3.  Without releasing the Whistle control, bring the throttle to the OFF position (0V AC on the track).  Once power is off, release the Whistle control. 4. After 3 seconds, a single bell will be heard.  Application of track power will place the engine in the Reset mode, and normal operation is restored.

7) Reset Feature 40 – Lockout Enable.  (8 Clanks, 0 Clinks) Reset 40 allows you to enable the Reverse Unit Lockout feature of ProtoSounds. When enabled, you are able to lock the engine to run in only one of the directional states (Forward, Neutral or Reverse) whenever power is applied. The most common use for locking out an engine is in the use of power blocks on a layout. To use, cycle to Reset 40 and press the Whistle control. The engine will play a series of bells. This indicates the current setting. Each time the Whistle is pressed, ProtoSound will cycle to the next available setting and provide the appropriate bell indicator. The settings for Reset 40 are 1 Bell = OFF, 2 Bells = ON. When the desired setting is reached, lock the changes by interrupting the throttle and cycling the engine into forward.

This was about the most advanced system of the time. Highly advanced but somewhat technically challenging.

Good luck. Forest.

Last edited by Forest

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