@Dominic Mazoch posted:Could be wrong. But I think the two systems, LIRR and MN, use two diffetent types of 3rd rail. One has top running, and the other under runnning operation?
Yes, you are correct. LIRR uses over running, and Metro North uses under running. At one time the MTA tried to make a universal third rail shoe that could be used on either without any special set up, but it just couldn't be made to work reliably.
Stuart