An outline was rendered using Panmap running NOAA WVS (world vector shoreline).
This was exported (as a bitmap, all that Panmap can do) to Paint Shop Pro. This was manually repaired (holes filled, island groups tweaked, and shoreline details clarified or erased). Then the bitmap was floodfilled, so that the subsequent vectoriser will produce polygons rather than lines.
This was imported into Inkscape and vectorised using Inkscape's "path->trace bitmap" function.
All details were then manually drawn.
Notes
Differences between this version and the offical Caltrain map:
The official Caltrain map is copyrighted by PCJPB.
It's bigger than the Caltrain map, and clearer when printed.
The official map doesn't denote express stops.
The official version doesn't have acute over e in San José.
This version shows the ACE interchange at Santa Clara, which the official one doesn't.
Updated font (from proprietary "Trebuchet MS" to free "Bitstream Vera Sans") to improve display and readability, modified legend layout (selective bolding), changed special service stop icon and modified notes on special stops, condensed rail connectio...