Run 45 - comprising (from the front) C3319, T4379, T4123, C3465, C3412, T4204, T4420, C3067 - collided with the rear of Run 108 - comprising (from the front) C3298, T4104, T4397, C3290, C3475, T4221, T4347, C3188 - on the down North Shore line south of Lindfield station. Shortly afterwards Run 123 on the up Shore line came into contact with the derailed cars on the other track, Run 123 comprising C3354, T4529, T4110, C3152, C3296, T4418, T4284, C3408. Car C3188 was withdrawn from service and condemned in October 1950, the first steel electric car in the Sydney fleet to be condemned. T4347 was also withdrawn from service, but not condemned until February 1965.
The other 22 cars involved in this incident went back into service, although the wooden trailers had shorter lives than the steel cars.