Hump yards are one of those things most modellers know by name but few have actually watched working. Sorting a whole train by gravity is hard to picture from a textbook, and this build tackles that head on: it recreates Kokand station's yard in Uzbekistan as a 3D simulation that shows exactly how the process unfolds, playable in a browser at a hosted web address. What makes it special is that the maker spent four years working at that station, so this is a real yard, not a generic one.
The way the sorting sequence is put together reads true to life. A locomotive slowly shoves the entire train up the hump, and at the crest the conductor walks along pulling uncoupling levers between cuts, where a cut is simply a group of cars headed for the same track. Each cut then rolls down on its own, and the switches route it to the right road. In the simulation, every car's colour shows its destination track, which is a clever teaching device in my view.
The details that stand out are the little touches of yard life: a worker riding a red boxcar during heavy rain, a radio voice calling the Russian word for uncouple, a worker using an uncoupling pole between moving cars, another placing a brake shoe on the railhead with a placement bar, and a closing map that labels the sorting, hump, transit and reception park areas.
One honest wrinkle remains: single cars and long cuts roll differently, so short cuts risk catching up on the switches. It is a real trade-off the maker flags openly, and to me it only adds credibility. Boxcars and a tank car with visible serial numbers round out the rolling stock nicely.