My Northern 4-8-4 has started throwing off the rubber traction tires...Are these tires supposed to be "glued" or otherwise fixed in place?...This loco has very few running hours, is 3 years old, and runs only at Christmas...Tires do not seem to be dried out...

I am an old HO scale fan and have been inactive for many years...Recently I bought a Bachmann N gauge Empire Builder train set to run under the Christmas tree...Big problem...The cars will not stay coupled...The train runs fine in reverse, but if run forward, any one of the cars will uncoule at random...I cannot get one lap out of the set without uncoupling...Any suggestions?...New couplers?...

Jerry