Adrian, thank you for writing. I bought the rail from a rail supplier.
There are a number of manufactures who offer both complete locomotives and rolling stock as well as kits, that the modelers can put together themselves.
Go to the Discover Live Steam web site and look at some who advertise models for sale. http://discoverlivesteam.com/
Our railroad is built in the 7-1/2 inch gauge track 1.6 scale and there are some built in 7-1/4 inch gauge, for the same scale. There are also some built in other scales with other track gauges.
All the best to you.