This roadbed is designed with a more realistic 30-degree slopes found in many  actual  railroad roadbeds.  The scale dimensions are  12" high, 14'-'5" across the top and 19.25" across the bottom.  Actual dimensions are  4.5 mm thick (approx. 7/32"), 5.4 cm across the top (approx. 2-1/8"" ), 6.7 cm across the bottom (2-5/8") and 32" long.  Minimum radius for the bendable products is 28".  Roadbed is sold in 8' bundles.  You receive a bundle of 6 strips, 32" long for each 8' of roadbed ordered.  Roadbed is in halves, so 6 pieces make 96" or 8' of roadbed.  This roadbed is designed so that laying it side to side will yield 2-5/8" track centers.