> And when I want google to use those lines to plan routes across them,
> do they all need to be 1 shape, or how do I have to build the railroad
> network?

You can't persuade the Google routing engine to use your data.
As already discussed in
http://groups.google.com/group/google-maps-js-api-v3/browse_thread/thread/5fb2a3655a4722f2/3465f27a584d81df
as you want to do custom routing, you will need to build your own
route database (this is about the logical connections of the route
segments, not just the data to draw the lines) and implement your own
routing algorithms.
It is not a trvial task.

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