Thanks for downloading my Delaware & Hudson repaints of the excellent C424 from DieselWorkshop.
Of course you will need the DieselWorkshop AlcoC424 PC2415 first. You get three unique numbered locomotives in that pack.  
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- Now you will notice that there is a new folder in your assets called Buzz456. You need it for the decals on both sides of the engines to appear.
3- Drill down to DieselWorkshop\AlcoC424\RailVehicles\Diesel\PC2415\Engine folder.
4- Copy and paste centurybody.GeoPcDx to your Assets\DieselWorkshop\AlcoC424\RailVehicles\Diesel\DandH\DandH2\DandH3 Engine folders.
5- Copy and paste centurycab.GeoPcDx from the PC2415 CabView folder to your Assets\DieselWorkshop\AlcoC424\RailVehicles\Diesel\DandH\DandH2\DandH3 CabView folders.

To use in a scenario
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In the scenario editor, enable content from DieselWorkshop, AlcoC424 and from Buzz456. By the way you need to tick the asset Buzz456 for each route in the route editor
you want to use in any modes (Quick Drive for instance) otherwise the logos won't show up on these units.
Now you should see the (DW)AlcoC424 DandH\DandH2\DandH3 Units along with other units from the DieselWorkshop DLC.

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I want to thank Chacal and Buzz456 for their precious help!

Enjoy,
Touzzz
(jtousign)