HL2 sound suitable for a car horn?

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I might be wrong, but somewhere there is the sound of a Combine APC siren.

These are the best I can find: apc_alarm_loop1.wav and apc_alarm_pass1.wav . Of course, you might be after a completely different thing, but if that is the case then I’m not sure.

The sound the combine razor train makes would be good, can’t remember the name of it though.