Trying to set up an HO set. Have a Bachman EZ track. Have a new smoke engine from last year. We have a 30 year old Tech II rail power 1400. Only one engine is working on the track (an old one - 30 years old), the others aren't. I'm wondering if the transformer/power needs to be replaced (it has worked before). Any advice on how to trouble shoot and what the issues might be?