The tube train buttons do, in fact, work - but they only activate when the train is at an outdoors station and the driver has enabled them. The London Overgrou

The tube train buttons do, in fact, work - but they only activate when the train is at an outdoors station and the driver has enabled them. The London Overground functions exactly like this. In addition in a previous life of actually programming pedestrian crossing systems, the button does in fact have an effect (or did). It sets a flag on the system which is checked after a predetermined set of time to see if the lights should stop traffic. Its all highly dependent on the road system, however.