A consensus of evidence suggests that at the moment of collision 2L51 had reached a speed of between , whilst 1D91 was still travelling at between , so that the net collision speed was about . After the collision the trains separated and came to rest apart. There was no derailment but the shock of collision passing down each train caused damage throughout the length of both. Only one vehicle sustained severe structural damage; this was the leading passenger coach of 1D91, running immediately behind the GLV. This coach sustained a small degree of telescoping at underframe level, and hinging down of its trailing end, so that the saloon floor buckled upwards by about with consequent displacement of seats in one bay. One window each side was broken when this deformation occurred through the window opening, but the general integrity of the vehicles could be judged by the fact that these were the only external windows broken throughout the two trains.