Perhaps someone can suggest whether we are looking towards the city or South Brisbane? Plume was once a fuel company. In this later photo I've heard that as the trams turned after leaving the bridge, school children would bounce up and down in the tram in an attempt to derail it, at times successfully. This photo looks to have been taken in the 1940s. (duh, the file name says 1930s)
My favourite Melbourne bridge would possibly be the Anderson Street bridge, but I like Princes Bridge too, but for history, I can't beat the Chandler Highway Bridge, a car bridge that was built for trains and now funnels traffic in various directions and many lanes of traffic into one lane each way. The natives are protesting about the congestion caused by a single lane in each direction bridge. Do you have a bridge you really like?