This may provoke responses questioning a one size fits all approach to sound. However from my experience playing TSW in multiple dlcs and hearing freight trains in the real world. The TEA wagon is the most true to life sounding wagon/tanker in the game and its running sound should be copied to all the other wagons forth with. With the only consideration being the amount of wheels and length of base.
Its the flat wheel sounds that ruin it. Every wagon seems to have one. Especially for a game with limited channels. This would be a good saving, to address this.
