 The crossings required catch points for the trams and interlocking with the railway signalling system.In 1925, the corporation, Ministry of Transport and the NER's successor the London and North Eastern Railway proposed to eliminate the level crossings at a cost of £1¼ million, but no work was done until the 1960s.The last improvement to infrastructure came in 1931 with the building of the North Bridge in the town centre allowing trams to cross over the River Hull avoiding the narrow Drypool Bridge.