There is no need for any switch because the strip incorporates a small sensor which detects when the train moves and turns the lights on automatically. Traditional warm white or modern cool white. No switch, turns on automatically as train moves.
Train Tech Automatic Coach Lighting Multipack - Cool White A (3) OO Gauge
Train Tech Automatic Coach Lighting - Warm White/Standard OO Gauge
Train Tech Automatic Lighting Effects Modern 2 Flash Tail Light OO Gauge AL4
SC100 Train Tech Automatic Colour Light Signal Controller
Train Tech Automatic Lighting Effects - Constant HO/OO Gauge TTAL3
Train-Tech CN22 Coach Light Strip: Warm White With Flickering Tail Light N Gauge