Here's my problem, my sets have been in the trunk since 1977. I have the old brass rails which I will be replacing with flex track. Engines were pronounced dead a few minutes after taking them out. These sets were starter sets from Tyco with Cox trailing cars which are still good for now, I ordered 2 Bachmann freight engines which run good. Now the problem is my old cars will not hook up to the new engine, this is not going to be a 23456789 thousand set up. I just want to make a little boy happy. Is there any couplings I can change just on the lead car so I don't have to change the next 20, Thanks a bunch