Some sources say that the bodies were transported to Brookwood for burial by lorry, not by rail, you'll do very well to try and find any facts surrounding Exercise Tiger even now
It seems that those bodies collected from the sea were taken to Portland and processed by 605th QM Graves Registration Company and then moved to Brookwood, method unsure. Those bodies that reached land were buried in Devon in the first instance before transfer to Brookwood by 146th QM Truck Company, later all bodies were moved to the ABMC cemetery in Cambridge for repatriation at the wishes of the families