I've started learning D3 for a new series of data visualization tools I'd like to build.
For a first exercise, I took inspiration from E.J. Marey's famous train schedule from the 1880s.
Unlike Marey's original design, or Mike Bostock's own attempt using Caltrain data (which I just found out about after completing mine), I didn't draw all the route lines at once.
Instead, routes are shown one at a time, by clicking on any of the station stops (I stuck with PATH's own color scheme for the routes: green is Hoboken to 33rd Street, red is Newark to World Trade Center, etc.).
The first attempt is a little rough around the edges, but is fun to play with.