Not a lot of geographical context here, although the central hub is pretty easy to discern. Does good work differentiating lines with a limited colour palette. Can anyone translate the legend at right that shows dashed/thin/thick lines? Is this an early attempt at frequency mapping?

Note: Thanks to all who have told me that the lines are thick for express routes, thin for normal routes, and dashed for “special” routes. So it’s service mapping, not frequency.

Source: Old Tokyo