I just recently set up an old electric train set for my grandchildren and I to enjoy. It is a 1953-54 Lionel steam locomotive. I am new to the hobby and trying to figure out running issues with the set. My transformer gets very hot after running for a while and it always has a hum to it. The train slows significantly when it is farthest away from the power lockon and this gets worse the longer I run the train. I would sure appreciate any advice anyone can give me.