Signalman
LE

Aside from the obvious problem of a bloody great gap between your train and many of the platform edges, how is your 'third rail' going to negotiate points and diamond crossings?Nope, signals, so you can count how many blankets you've got from far far away.
How is Track Circuit interlocking going to work?
How is your rolling stock going to negotiate bridges and tunnels designed for a different loading gauge?