New answers tagged google
I have recently written a tutorial about the S2 and I think that the S2 is what you really need. I have made the same you need in the tutorial so I won't repeat the code here.
Using https://www.google.com/mymaps has the option to export to KML or KMZ, but only if you built your directions in the mymaps interface.
I've used GTFS editor https://github.com/conveyal/gtfs-editor , and it works pretty well. There is a moderate hump (usage of the command line) to get over for getting it up and running, but once that is done it's straightforward. If that is too much, TransitEditor is hosted and supported.
Transiteditor ,Transitdatafeeder and several other free and COTS tools are mentiond here https://code.google.com/p/googletransitdatafeed/wiki/OtherGTFSTools
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