At its maximum length the kit is 200 scale feet long. Kit can be built shorter in increments of 25 scale foot (3-7/16" 8.8cm) segments down to 100 scale feet. Shoe-to-shoe/abutment spacing 27-3/4" 70.5cm; 2" 5.1cm track centers; overhead clearance above Code 83 rail 3-31/64" 8.9cm. Total inside clearance width: 4-1/32" 10.2cm. Kit is injection-molded styrene.