This is one of my most favorite stamp series from my collection!
You don't have to be a train fan(atic) to like this. :)
It's more than "some trains on stamps" - it's also a glimpse into other cultures, other historical periods, looking at those people and their dresses.
This excellently-drawn and designed stamps series was probably NOT manufactured by "the good, crafty people" of Liberia.
Like so many other stamps, they were probably manufactured in another country, wherever the philatelic agent/contractor saw fit to do it.
If you know the truth about it, tell us! :)