Created by “jeflu”, who says:

A better Caltrain map: Caltrain’s current route map looks outdated and provides very minimal transfer information. I’ve created a refreshed map which provides more comprehensive transfer info (to other transit systems and airports) as well as a one-way fare chart. Stations served by Baby Bullet express trains are in bold. A current drawback: I left out all weekend-only and south-of-San-Jose stops. Future renditions could include those.

Transit Maps says:

This is nice! Much, much better than the stale old official map.

The bold names for the adorably-named “Baby Bullet” service is simple but effective, and doesn’t clutter the map up with an extra route line for this express service.

Perhaps the BART services out of Millbrae station could point north rather than south to better reflect the direction trains actually travel in, but that’s a very minor quibble.

Lovely colour palette, too. Four stars!