Mark first enters the world of the Railway while running away from home. Inevitably,
he becomes the Railway’s Runaway Avatar, the person who embodies everything there
is about being a runaway. End result is that whenever he’s faced with danger, Mark’s
first response is to run.
On occasion, he can be forced into doing something other that running, but it’s got
to be the only way out before he’ll do it. If the alternative is death, and he can’t
run, then he’ll do whatever it is that he has to do, but he really won’t like it.
He’s also learnt to be pretty good at hiding, and at not being noticed – both useful
skills for a runaway.
Eventually, he is recruited by the Board of Transport to be an apprentice. Most runaways
end up dead, but those who survive have a variety of skills that the Board can use.