For instance, they already have to run power on a third rail, don't they? What's wrong with time-domain reflectometry
The third-rail is not continuous, not all segments are energized all the time, and a single train can make simultaneous contact with multiple 3rd rail segments. It's probably not impossible to do, but it's also probably not trivial.
The third-rail is not continuous, not all segments are energized all the time, and a single train can make simultaneous contact with multiple 3rd rail segments. It's probably not impossible to do, but it's also probably not trivial.