The booster was used to help start 'heavy' trains since steam has 'low power' output when starting.
Railroads didn't find them that 'helpful' and too much of a maintenance headache.
Mainline is 400' long, with passing sidings, two 400 car yards at each end, minimum radius of 48" and 1500' of track.
All track is hand laid on wooden ties and 100 hand made turnouts.
I can lay the rail so no two joints are 'across from each other' so derailments are minimal.
Any derailments are, usually, do to the cars not being properly checked by me.
Running 20-45 freight car and 10-17 passenger car trains puts a lot of stress on the cars 'up front' so track has to be in excellent condition.
I can reach all track but it is difficult in a few places and I could never adjust the rail in those places.
Fortunately, after 44 years, I've been lucky that the track has remained stable in those spots.
Adjustments to track is, rarely, needed.
The last time I adjusted track was for some engines that had 'more scale' width drivers that were narrow so some 'gauge adjustment' was needed and that was several years ago.
