Sculptamold
  Sculptamold
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Structures
The Ideal Scenic Modelling Compound much recommended in articles in the US modelling press now available from EDM Models.
Sculptamold is a dry, white, non-toxic compound that combines the best features of clay, plaster, and papier mache. After shaking closed bag to thoroughly blend contents, add water to Sculptamold as directed on bag and begin modelling. Sculptamold sets in 30 minutes, so prepare only as much as can be used in a half hour of modelling time.

Sculptamold clings to almost all clean surfaces and does not shrink so it can be applied to an armature or any core without fear of cracking. Finished pieces are very lightweight, strong and durable, and may be carved, sanded or shaped with tools.

One three-pound bag of Sculptamold will make 141.75 cubic inches of solid material. Twelve three-pound bags will make one cubic foot of solid material.

They don't mention model railways but look at the pictures below for examples of what it can do
 
Order your Sculptamold now. 8.50 for a 3lb bag
  OVERSEAS ORDERS - PLEASE BE AWARE THIS IS EXPENSIVE TO SHIP OVERSEAS - TWO BAGS TO SWEDEN, FOR EXAMPLE, COSTS 38 BECAUSE OF THE WEIGHT.