In train simulator, almost all trains have a loco image. An example of this is here


This is for the V200, i will be using this for my tutorial

Ok, lets go onto google and find an image of the V200

This'll do nicely
To select it, use the "snipping tool" on windows that looks like this


and select, "New" and drag over the image!

Keep that there

Once you have completely selected your image, click save and copy this film link into the top

C:\Program Files (x86)\Steam\steamapps\common\RailWorks\Assets\Kuju\RailSimulator\RailVehicles\Diesel\V200\Default\Engine\LocoInformation

(This will vary depending on the loco you use)

Select the file called "image" and then click save. An error will appear, just click yes

NOTE: snipping tool wont always default to PNG file, just make sure it is ok.

Now open TS

And there you go

Hope this was useful :P