Gmod missing train sound from Half life 2

Hi guys, i’m working on a map but i need to add the train sounds from hl².
The problem is that gmod doesn’t have those sounds, and i don’t know how to add them to the game.
I have own half life 2 off course :slight_smile:
Can you help me please :frowning:
Thank you !

Those should be standard source sounds, with or without HL2.