Hi just wondering what the smallest trolley, engine, eggliner, or anything g scale  that is made that has a motor unit in it is?

Hi just ran my Silverado yesterday and it was running great. Today the engine is acting like the brakes are on, not moving? Any suggestions?

Hi, just purchased this set while my layout is now being built. I put the engine on the piece of track and noticed all the wheels are touching except the middle wheels. Anyone else notice this? Still runs okay? Thanks!