This is a Southern Pacific bloody nose re-paint of the excellent DTM F3 unit.      
Of course you will need the DTM F3 UP DLC first.

Installation
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1- Open the zip archive, find the Assets folder, drag it to your Railworks folder. Answer "Yes" to the prompt about merging the Assets folders.
2- Drill down to DTM\F3 UP\RailVehicles\Diesel\F3_Engine_SP folder.
3- Copy F3_SP_01.GeoPcDx and F3B_SP_01.GeoPcDx to your Assets\DTM\F3 UP\RailVehicles\Diesel\F3_Engine_SP_Red_Nose folder.
4- To allow the repaint showing up in the scenario editor and to see the repaint when opening the doors from inside the cab:
- Go to the DTM\F3 UP\Railvehicles\Diesel\Cabview folder.
- Copy F3_Cab_SP_01.GeoPcDx, and paste it at the same location, i.e. make a copy in the DTM\F3 UP\Railvehicles\Diesel\Cabview folder.
- Rename the copy to F3_Cab_SP_01_Red_Nose.GeoPcDx.
- Open the copy with TS-Tools. Click on Search and Replace, write "f3_engine_sp" in lowercase in the top window and "engine_sp_red_nose" in the lower one. Then click on Replace All. Save it and that's it.

To use in a scenario
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In the scenario editor, enable content from DTM, F3 UP.
Now you should see the F3-SP_Red_Nose Unit, the no driver Unit and the B unit along with other units from the DTM DLC.
Also you get a bonus winter version of the SP_Red_Nose Units.

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I want to thank Chacal for his precious help!

Enjoy,
Touzzz
(jtousign)