Build a refined 3D valley-railway dispatching diorama. Two original small trains travel between two stations, sharing one single-track section and one passing loop. Users control switches and signals to arrange safe passing. Signals must block a second train from entering an occupied track. Provide overview and locomotive-follow views, pause, and speed controls. Wheel and connecting-rod motion must follow actual travel distance. Show the result after three successful passing operations. Deliver a complete website that opens in a browser, with editable source files and real 3D geometry for the main objects. Show the subject immediately, with clear controls, reset, and mobile operation. Controls must actually affect the scene. Also deliver an approximately 12-second 16:9 hero video captured from the final scene, a matching cover, and a brief remix description. Audio is off by default and starts only when the user enables it.

Build a refined 3D valley-railway dispatching diorama. Two original small trains travel between two stations, sharing one single-track section and one passing loop. Users control switches and signals to arrange safe passing. Signals must block a second train from entering an occupied track. Provide overview and locomotive-follow views, pause, and speed controls. Wheel and connecting-rod motion must follow actual travel distance. Show the result after three successful passing operations. Deliver a complete website that opens in a browser, with editable source files and real 3D geometry for the main objects. Show the subject immediately, with clear controls, reset, and mobile operation. Controls must actually affect the scene. Also deliver an approximately 12-second 16:9 hero video captured from the final scene, a matching cover, and a brief remix description. Audio is off by default and starts only when the user enables it.