Here is a picture of the jig we used to bend Dual Gauge track down to an O-80.
We cut a jig and then attached that to another piece of plywood.
3-4 ties were removed from each end.
Next, the track was bent from about 6" inched from the end of the track slowly bending and working the ties.
When installed we will have lines drawn to follow and will work from one end to the other.