Installation:

Copy and paste the Assets folder into (x86)\Steam\steamapps\common\Railworks.

Next, navigate to the following directory: RailWorks\Assets\RSSLO\BR187\RailVehicles\Engine

Locate the "BR187_Railpool_30X.GeoPcDx" file. Copy this file to: RailWorks\Assets\RSSLO\BR187\RailVehicles\187_508 Metrans

The process is complete.