🚦 Railway Semaphore: Wire Stretch, Counterweight and Lever Throw (2D)

Side view of a mechanical semaphore signal worked by a long steel wire from a lever frame. Set the wire run, temperature, wire diameter, counterweight and lever throw, and see how thermal slack, elastic stretch and pulley losses eat the lever travel before the arm moves. Counterweight torque, virtual work and a travel budget, with four in-page numerical checks.

2D · HTML5 Canvas 2D · 60 FPS target · runs fully client-side, no install