For anyone looking for a simple process to apply to all their maps (both campaign and scenario), you can use Powershell to do it quickly:
Unpack RT2_Port.exe into "C:\Program Files (x86)\Steam\steamapps\common\Railroad Tycoon 2 Platinum\maps" - for a Steam install you can find this quickly by right-clicking the game as choosing "Manage" > "Browse Local Files"
Open powershell and execute the below - you may need to run as admin depending on your account configuration
cd "C:\Program Files (x86)\Steam\steamapps\common\Railroad Tycoon 2 Platinum\maps"
ls *.MP2 | ForEach-Object { .\RT2_Port.exe -fw $_ }
