It's really just engine idle, because thats all what this game has unfortunately. Once train moves it's only tracks sounds and those are loud enough. I would hope for proper diesel locomotive sounds in this game, especially now when train can stop thanks to other mods.....you can make it even louder if you wish.

installation:
-use OpenIV to look for vehicles.awc in x64\audio\sfx\RESIDENT.rpf
-extract vehicles.awc with "Export to openFormats", it will create folder vehicles and file vehicles.oac
-into vehicles folder drop and replace my modded files from louder folder
-reimport vehicles.awc using Import openFormats

...if you never done it...
in OpenIV select RESIDENT.rpf so all your awc files will be on right. Click New, select Import openFormats, select vehicles.oac, click open, click OK to import.

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I would hope for more detail with trains, like slower take off too.... there are settings for slower stopping in traintracks.xml, setting braking distance to about double looks pretty good, but it's linear, so it's stopping too slow at end. It will show in video