This is for servicing and presenting locomotives with up to 4 driving axles and coupled axles. It is ideal for models of the class 218, class 185, class 189, class 24, and many other units. It is made of anodized aluminum sections. Four adjustable pairs of roller brackets with precision ball bearings are included. Track is included for positioning non-powered axles. The useful length for the roller brackets is about 120 mm / 4-3/4". The 89933 expansion set of a pair roller brackets is available for using locomotives with more than 4 driving axles and coupled axles. The test stand has train power connections for a conventional power pack. Approximate dimensions 209 x 59 x 27 mm / 8-1/4" x 2-5/16" x 1-1/16".