Hey guys I'm stumped on a problem I'm having with a 2-8-4 Berkshire by rivarossi. Every once in a while the engine just seems to seize up on me in both forward or reverse. Then by some miracle the darn thing starts up like a top and runs.......Its clean,oiled,greased and the motor is right on the money. I've had it appart a few times to check the gears and I can't seem to see any problem.......does anyone else suffer from this malady? Last resort is to take it to the shop and have it checked.....I hate spending money especially if I can fix it myself.....but there's always that one horse that can't be ridden!