Also known as
Carlton swing bridge
see: https://marinas.com/view/bridge/88urr_Carlton_Swing_Bridge_Lowestoft_GB_United_Kingdom

used to be known as:
Carlton Colville swing bridge
See: https://railwaywondersoftheworld.com/ger.html
or
https://archive.org/details/ourhomerailways00gordgoog/page/n258/mode/2up
archived version of "Our home railways, how they began and how they are worked" from 1910 (longish loading time)