This DCSV is for the Soldier Summit F40ph
to use it unpak the "SoldierSummit" ap file with 7zip or Simular. then Do Ctrl+A to Select all. the file you need to unpack is here

C:\Program Files (x86)\Steam\steamapps\common\RailWorks\Assets\DTG\SoldierSummit

then go back into the main Soldier Summit Directory and past by right clicking with your mouse
then place the dcsv file here
C:\Program Files (x86)\Steam\steamapps\common\RailWorks\Assets\DTG\SoldierSummit\RailVehicles\Diesel\F40PH\AmtrakPhaseIII
overwrite when asked