This series comprises blueprint plans of the Indooroopilly Railway Bridge, which was constructed across the Brisbane River at Indooroopilly, immediately upstream of the older Albert Bridge, between 1955 - 1957. The bridge was designed by the Co-Ordinator-General's Department and constructed by Electric Power Transmission Pty Coy, the steelwork for the superstructure - except for bearings and 60 tons of deck steelwork - being fabricated by the Societa Anonima Elettrificazione S.P.A. of Milau, Italy.
The bridge is 208.5 metres long and the superstructure was designed as a two-span parallel chord Warren Truss with verticals, continuous over the two spans. The central pier caisson was constructed in the Cairnscross Dry Dock, 21 kilometres downstream of the bridge site. It was towed into place by two tugs and, after seating on the river bed 15 metres below water level, was sunk by open dredging to rock 22 metres below high water. Excavation to sound, unweathered schist was achieved under compressed air using airlocks. The truss superstructure, which had been fabricated in Italy, was erected on rollers in an erection bay constructed on the north side of the river. Gradually the span was rolled out over the river, adding further bays on the back end of the truss, until the cantilever end of the truss could be picked up on a trestle constructed on the hulk of a 700 tonne cargo vessel the S.S.. "Alagna". The span, with its leading end now supported on the ship, was pushed out until the truss could be landed on the control pier and the northern end on the abutment bearings. The second span was then built by cantilevering out from the span just erected, until the Chelmer (southern) abutment was reached.