Noah's Railyard is a minetest world with at least one of every type of wagon available for advtrains, from all known sources to the author. There is a large railyard with many tracks in it. They are loosely classified with different themes on each track. A short line is included to take the trains for a test drive, which will be larger in future and include some stations, as if the railyard were like a railway museum with train excursions. The yard is also built with a loop around to help you shunt the trains around.
Noah's Railyard is meant to be complementary to the train catalogue available on the advtrains wiki. It lets you test out pre-made trains and shows you what kind of wagon arrangements you would want to use to make trains appropriate to a specific train mod
Why is the bike mod included? The bike painter is currently used as a tool to paint the JRE E231 series wagons as well as the some_more_trains tram. It will hopefully be deprecated in favour of a train painter in future.
Why don't you have any of the coloured subway wagon mods? As far as I know they are all out of date with advtrains_train_subway anyway, and one day they will all be deprecated by livery features as well. Basically, they are a bad idea.
Blockhead started this project, but feel free to point out any new trains that get added or that I have missed.
Download here (.tar.gz format): https://files.catbox.moe/ccjmcg.gz