Useful? Definitely!
It's scale compression with out the hassle of actually compressing anything.
I'd originally planned on making a 28mm engine,however once I'd built the Shay engine land train,and carriages it dawned on me that it filled all my gaming needs (for pulp and bob)so no need to waist time on a new engine.
Now this means I can still have a railed train.I wonder if you could use something like an alpine train carriage to do a more'conventional looking' train?
Only issue I can see for a scratch build,is it's likely to need a counter weight as it might end up pulling wheelies every time the table gets knocked if you add a metal crew.