This pack comes with two different sizes of truss frame designed to fit on different lengths of wagon. The pack is scaled to N gauge however can easily be scaled up to 00 gauge, TT:120 and 3mm.
 
For those modelling in TT:120 the model can be scaled by 125% and those modelling in 3mm can scale the model by 150% and those in 00 gauge can scale by 200%