The boulders (and textures) originally came the Train-Sim.com website. A guy called Ron Spalding put them together for distribution with non-commercial routes. His Readme said:
License and disclaimer:
This file, and all contents including shapes and textures is the original work of and copyright © 2002 by Ron (ChooChoo) Spalding.
These objects may be included in a distributed non-commercial Route for MSTS, but they may not be used in any commercial project or distributed singly without the written consent of the author.
These objects are provided "as-is" without any warranty of any kind.
Comments and questions should be directed to:
Ron Spalding (ChooChoo)
email: ChooChoo@maleposer.com
On this basis I'm sure you're OK to use them.
Best wishes,
Batroost





