Safetran was an American manufacturer of railroad signal equipment best known for its grade crossing lights, gates and bells. Its Type 1 electronic bell became a common sight and sound at crossings across the United States, where it replaced older mechanical bells with a more reliable synthesized ring. Railfans recorded the distinctive pattern at real crossings and shared the clips online, and the sound was later recreated in train simulators, model railroad setups and fan made crossing animations, keeping it familiar even as newer bell models appeared.