Can someone help me out. I was asked today how is it safe to run a steam loco on a 3rd rail system, and I ws unable to answer. My friend's main issue was that when the injector is opened at first, and when it is shut, water could come into contact with the third rail. However knowing steam runs down south on the 3rd rail network I said this wasn't a problem but my mate couldn't quite grasp this. Is there then any precautions needed to be taken when operating on a 3rd rail or do you just go about as normal?