This is for servicing and presenting locomotives with up to 8 driving axles and coupled axles. This roller test stand is suitable for the "Big Boy". Eight adjustable pairs of roller brackets with precision ball bearings are included. The aluminum parts of the roller brackets are black anodized. The construction and technical features are the same as the 78150 roller test stand. Dimensions520 x 42 x 30 mm / 20-1/2" x 1-5/8" x 1-3/16".