I just broke out my old Tyco Clementine that I haven't used since I was about 10 (circa 1979). Unfortunately the engine wasn't working. While it's being repaired I picked up a Bachmann Chattanooga set for around the Xmas tree. It only has 5 cars, but the engine wheels spin at spots when all cars are on. The track is on the floor, but I live in an old farmhouse so it may be slightly uneven. Is there a way to gain traction?