>   However, I'd like to generate directions based on a specific route
> (think bus route).

I think you're going to have to write a routing engine
http://www.google.co.uk/search?hl=en&source=hp&q=routing+algorithm&meta=&aq=f&oq=

Given the limited network, known interchanges, and (presumably) known
costs it may not that difficult.  A lot of table building work can be
done in advance.

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