Same thing happened to my LC+ 2.0 Big Boy #4012, only it was the rear set of wheels. Unfortunately, I found out after picking up the model. So I had to find the screw, place a tiny piece of painters tape over the small hole for the transmission piece that goes from the motor to the gearing, carefully place the piece back onto the motor shaft, lubricate the area around the tape, and reattach the wheel set.
Same thing happened to my LC+ 2.0 Big Boy #4012, only it was the rear set of wheels. Unfortunately, I found out after picking up the model. So I had to find the screw, place a tiny piece of painters tape over the small hole for the transmission piece that goes from the motor to the gearing, carefully place the piece back onto the motor shaft, lubricate the area around the tape, and reattach the wheel set.
Love that LionMaster!! Are those RailKing Santa Fe cars behind it? They look really nice!!
Yes! When I put these along side a similar set of MTH Premier cars, the primary difference is length, and some small labeling details :)