The Murulla rail accident involved the collision of the Sydney-bound Northern Mail with runaway goods wagons near Murrurundi, in the Upper Hunter Valley on 13 September 1926 and killed 26 persons. A goods train had become divided and the attempts of the train crew to reunite the portions resulted in 12 vehicles running away down a steep gradient, and colliding with the approaching mail train. This was the worst accident on the New South Wales rail network until the Granville railway disaster in 1977.