It was one of only a few installations of this type in NSW. Between 1935 and 1942 the Metropolitan Water Sewerage and Drainage Board built a new diameter pipeline to pump water from the recently completed Woronora Dam to the Board's reservoirs at Penshurst. The pipeline was carried over the Georges River on the Como railway bridge, supported on new steel outriggers cantilevered from the main girders. To maintain an evenly balanced load, the pipeline was split into two diameter mains, one supported on each side of the bridge. The old Como railway bridge was finally superseded in 1972 by a new double track reinforced concrete bridge, built alongside the existing bridge. Responsibility for the old bridge was transferred to the Metropolitan Water Sewerage and Drainage Board, now Sydney Water. Sutherland and Georges River Councils, the local authorities on either side of the river, shared the cost of converting the railway track to an extensively used cycleway and footpath, which opened in 1985, 100 years after the construction of the bridge. In the late 1990s Sydney Water undertook upgrading works to the pipeline and maintenance gantries to repair leaks and comply with current OH & S requirements. An iron lattice girder bridge. Formerly a rail bridge. Sydney Water has had a sewerage pipeline running across the bridge for many years. The railway infrastructure has been removed from the deck and the bridge deck is used as a pedestrian bridge over the Georges River. Rail infrastructure removed from the bridge deck and replaced with bitumen footway. As of November 2018, the Como Rail bridge is significant as the longest single track lattice girder bridge in New South Wales and is a rare example of this type. Historically, the bridge contributed to the opening up of the southern suburbs of Sydney in the 1880s. While the rail infrastructure has largely been removed from the bridge, it continues to serve an important function, supporting the Woronora to Penshurst Water Supply Pipeline, part of Sydney's fifth water supply system. It also provides an important pedestrian link across the Georges River. The Old Como railway bridge was listed on the New South Wales State Heritage Register on 15 November 2002 having satisfied the following criteria. The place is important in demonstrating the course, or pattern, of cultural or natural history in New South Wales. The Old Como railway bridge is one of Whitton's 12 original lattice wrought iron girder bridges and is of high significance and visibility in the surrounding area. It is a major structure in the area and indicates clearly the level of design and technology involved in early railway construction to cross a major river.