Pathed interiors

This is a popular topic, i have browsed at least 5 different resources, all of them out of time(city on the verge of forever), and have alas come to this point where i must make a new thread. What triggered this is watching the showoff area, and realising that some bastard managed to path a monorail cab exactly the way i wanted(on a side note, pretty nice cab, although not my kind of sci-fi/semi futuristic style(i want them rusty!)), and neither mentioned it or was commented about it, which makes me believe it is either simpler than i think it is, or that im retarded(lets hope not, it would be quite an surprise after 19 years of being piss arogant and correcting everyone when they say something wrong =) ).

What i want is some way to path a dif so that i moves along a path of points(quite obviously), that somehow transfers its speed to any playerobjects onboard(meaning they dont fall off). Any ideas where to go with this? I have looked at most resources, and im not afraid of modding the engine, though i have no experience at all with c++ except from moding torque, so that would be through a guide in that case. Thanks for your time

Edit: sorry, i read wrong =) You can free-cam while inside the cab, you can NOT walk around in the cab(it leans to the retarded angle at the moment). But its still impressive funtionality that i would like to learn about.