This Portugal cork sheet, (915 X 610 3mm)[3' X 2' X 1/8"] is ideal for track underlay.  It can be cut to size to suit your scale of model Railway.

Sculptamold is a dry, white,non-toxic compound that combines the best featuresof clay, plaster, and papier mache, does not shrink, and is durable for dioramas, 3-D sculptures, model railroad scenery and...