By the time you reach the fifth add-on, you already have your Class 1 road locomotives (SD40-2s, GP38-2s, maybe a Dash 9). Part 5 does not give you more leaders; it gives you .
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Once completely extracted, move the resulting folders into your MSTS directory (usually placing route folders into MSTS/ROUTES/ and train files into MSTS/TRAINS/TRAINSET/ ).
The wagon selection here focuses on :