I recently purchases an 0-4-0 Matura (pre-Tyco) locomotive. The boiler is cast and the cab is plastic. The motor is in the boiler with a worm drive connected directly to the front axle. When the loco is run for over five minutes it gives off a smell similar to that of burning electronics. This is DC. Only pulling 5 cars that move very freely on a flat oval. There is not a smoker on this. Any ideas what the smell is and is it something to worry about. There performance of this little engine is great for its size. With you could still get these new.