For the 316 miles, it could take three days. The main reason is the troop trains were too long, and the engine couldn’t pull this train and its load over some of the rises in the track.
So the driver then, or the guard, would unhook half the train, leave it there, take the forward half forward to the next siding, unhook it, come back, and pick up the second half, and then proceed.
Hour, hours literally wasted. Also, the engine, on more than one occasion, would run out of coal. So the whole of the troops onboard the train would scavenge across the paddocks - literally - picking up firewood to keep the boiler going.