Try again. I fixed the links. Unfortunately, the only documentation is
there at the wiki. But if you download an interpreter and put in one
of the sample programs you should be able to see how it works. The
train moves starts at the '$' and moves along the rails executing
instructions as it passes over them. Simple rails are just - | / \
characters and junctions are * + x and they usually do the obvious
thing.
The only tricky bits are the junctions which are v ^ < > which move
the train on the right-branch (based on the trains original heading)
if the thing on the stack is true and the left branch if it is false.
Please post any programs you make. It is always fun to see what other
people do with something like this...
-D