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For diesels, I use this circuit to provide Rule-17 lighting control, two level smoke volume control, and automatic cab light control.  When the engine stops, the headlight dims, the cab light comes on, and the smoke volume is reduced.  When the engine is moving again, the headlight is back to full intensity, the cab light is off, and the smoke volume is full.

FWIW, I offered kits to build these some time back.  I never had enough volume to justify making it a product like the steam products or my lighting kits.

Locomotive Motion Sensor Module

Here's an application drawing showing how it's wired into a locomotive.

Locomotive Motion Sensor Sample Application

Here's a schematic of the actual module.

Locomotive Motion Sensor, Rev. 3 Schematic

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Images (3)
  • Locomotive Motion Sensor Module
  • Locomotive Motion Sensor Sample Application
  • Locomotive Motion Sensor, Rev. 3 Schematic

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