In 1941, the last ferry and the last train ran on the NWP Interurban commuter line, and Marin was handed over to the battle of its life against the car-centric development unleashed by the Golden Gate Bridge. Marinites, unlike most of the country, won that battle, and we maintained the transit-oriented development passed down from the age of rail. Most of us, though, don't even know what it looked like, and the best thing we've got are grainy maps and schedules from the 1930s. That's all well and good, but hides the structure and sinews of the system. The purpose of contemporary transit mapping is to combine not just where a system goes, but how and, to a lesser extent, when.
I've created two maps that do just that for the Interurban. The first is in an "old" style. Old printing techniques could only print two or three colors. Given that the Interurban shut down in 1941, I thought a map inspired by that era made sense.
The second map is the same thing, but in a "new" style. With contemporary printing techniques, we can do as many colors as we like. The advantage is that individual lines can be individually colored, snapping into focus what lines go where.
As you can see, it was quite a comprehensive system, at least for Central and Southern Marin. Northern Marin was served by intercity rail, more akin to Amtrak than BART, and was not part of the electric rail system highlighted here.