between Boya and on 24 January 1954 and the route was closed from Koongamia to Mount Helena on 12 March 1965. Some remnants of this original line exist today: Darlington - The platform remains and forms part of a reserve. Glen Forrest - One signal remains at the station site and the station master's house is used by the Darlington History Group. Mundaring - The platform and grounds have been turned into part of the Mundaring Community Sculpture Park and the station master's house is now the office of the Mundaring and Hills Historical Society. Second route Also known as the Parkerville deviation or Mahogany Creek deviation, the Second Route via Swan View, John Forrest National Park, Hovea, Parkerville and Stoneville to Mount Helena, opened a little over a decade after the First Route, on 1 July 1896. It increased railway capacity to the east, while offering less demanding grades and improved safety compared to the alignment of the first route. The line was originally only a single track, and featured Western Australia's first and, until 1990, only railway tunnel. Due to ventilation problems, in 1942 the tunnel was the cause of a runaway train crash, prompting calls for a fix. As traffic increased the newer route was duplicated in the 1930s, with the Tunnel Junction signal box established to manage traffic through the still single-track tunnel. A single-track diversion of the tunnel was completed on 25 November 1945, allowing trains heading uphill towards the east to avoid the tunnel and providing double-track operation along the entire line. The Second Route closed on 13 February 1966, coinciding with the opening of the Third Route. Third route The Third Route, also known as the Avon Valley Deviation, opened on 14 February 1966 and coincided with the closure of the earlier two routes of the Eastern Railway. In the 1940s, it became clear to the Western Australian Government Railways that the original Eastern Railway alignments were not suitable for future traffic and the loadings that were to be carried between the coast and the areas east of the Darling Scarp. As part of the Federal Government's program to build a standard gauge line across Australia, and the passing of the Railways (Standard Gauge) Construction Act 1961, work commenced on a new alignment further north through the Avon Valley, built with easier grades. This work also involved gauge-converting the remainder of the line