I'm looking at the documentation for the new ESU sound version of the Walthers Mainline SD50. The horn and bell options seem to reflect contemporary SD70ACe or ES44AC options. The doc itself doesn't say which engine type is covered in the sound file. The SD50 had a 645 engine, while SD70s have a 710 engine. Does anyone know if the ESU sound file in the Walthers Mainline SD50 has 645 engine sounds?