 As freight traffic grew, several sidings and loops were added to the main line to serve harbourside businesses.The Town Bridge was rebuilt in 1930, and the tramway initially routed through the northern arch.Between 1938 and 1939 the tight curve between the Backwater and harbour was supplanted by a new curve on a newly-infilled section of the quayside and the tramway was relocated to the outer arch of the bridge, where it remains today.