This clip comes from Trainz, where it is listed as Idle 1.wav, the idle sound for the Silver City Comet DP103 in the simulator. The Silver City Comet was a New South Wales Government Railways diesel train, and its distinctive chime has been kept alive by railway enthusiasts who recreate historic Australian rolling stock in games and videos. Because the recording is short, clean and instantly recognisable as a train signal, it continues to be shared on soundboards and reused in railway edits long after the original trains left regular service.