 There was gradual expansion over the next twenty-five years, both by the opening of additional routes, and the acquisition of new tramcars, with the final batch of trams being purchased in 1930 for use on the Lochee route.The Corporation started to run motor buses in 1922, and some of the tram routes were replaced by buses from 1928, but the official policy was that the trams would be retained, and a programme of rebuilding them was carried out.By the end of the Second World War, there were 56 trams in service, somewhat lower than the peak of over 100 trams, but heavy repairs to the infrastructure and new vehicles were then required, and the decision was taken to shut the system down.