This roadbed is designed with a more realistic 30-degree slopes found in many  actual  railroad roadbeds.  The scale dimensions are  18" high, 13'-6" across the top and 19.25' across the bottom.  Actual dimensions are  7 mm thick (approx. 9/32"), 4.7 cm across the top (approx. 1-7/8" ), 6.8 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.