Notes about the TRK3 file extension:
To open this file type, a required software must be installed. Without it you only see a Windows message "The following file cannot be opened
" (Windows 7) or "How do you want to open this file?
" (Windows 10) if you double-click the file. There click on "More apps"
and choose a suitable software to view such files on your PC or from email attachments.
The TRK3 file type is primarily associated with 'Rail3D 2KD/2k3'. Rail3D is a Railway Simulator. Build tracks, set up points and signals. Run trains, set routes and timetables. Make the trains stop, reverse and shunt. All to prototype practices.