This is a dual rail track bridge, based on the Brisbane River crossing at Indooroopilly. The two spans are 210 metres overall and the bridge places as one object.
It dates from about 1940.
The bridge is a mocrossing object and the height is adjusted by raising the ground beneath the centre of the span. Track will connect to the bridge, but you need to use very short lengths of track to connect other bridge splines to it.
Once installed you will find it as Indooroopilly Rail Bridge in the Australia scenery listing.