(That’s actually about the Rock Island Line, and this is about a different line, but it seems apposite.)
It’s a wild dreamlike re-interpretation of the RL commuter rail line of the same name; in one of those great SL synergies it started in casual conversations about the differences between various people’s living and working environments, and grew into this lovely impressionistic world. I helped with my usual small scripting contributions, and this time even some of the building!
It was wonderful fun to watch it emerging out of nothing (what an age we live in), and while you don’t get to have that fun, you can visit the announcement, and the sim itself (Kitely account or something required I guess?), and ride the train, and watch the movies, and find out what’s down there in the tunnel at the end (and it’s not Grand Central Station, muhahaha).
(Scripting note: llSetKeyframedMotion works very nicely in Kitely these days, and therefore I assume probably also in OpenSim; I do advise not entirely trusting that the moved object will arrive exactly where you expect it to, especially the first time after a sim reset, and setting at least a backup timer as well as the usual at_target() event. But it’s running the trains and cars and trucks and tugboats in the Hudson Line sim just fine!)