precast concrete units, in a Federation style with a Marseilles terracotta tile roof. Expansion of the station began in 1913 and continued into 1915. Changes involved the extension of the platform and yard, the signalling and interlocking of the station and the construction of a timber overbridge and new station buildings. The main station building was "nearing completion" by September 1914. Its main spaces survive, although the former refreshment room and kitchen are now the gift shop and cafe, and the former kitchen yard is now a lean-to extension. One of the earliest stations to be built in Australia using standard precast concrete units, Kuranda is the second oldest remaining example of its type in Queensland. Two earlier examples at Northgate (1911–12) and Chelmer (1913) in Brisbane have both been demolished, while another example opened at Ascot (Eagle Farm Racecourse) in February 1914 survives. A luggage lift from the overbridge to the platform, installed in 1915, was demolished after 1939, but a new lift with a shed at its base has been built since 1994. The signal cabin included a fully interlocking McKenzie and Holland 37-lever mechanical signal frame (still extant). Before railway "safeworking" systems were computerised and centralised in Queensland, mechanical signals were controlled from signal cabins, which dealt with the traffic on a particular block of railway line. Signal cabins coordinated signals that indicated whether or not a section of track was clear of other traffic. Early signals were mechanical, while later signals were operated electrically. The most common form of mechanical signal was the semaphore signal. These consisted of a metal framed tower with one or more arms that could be inclined at different angles, with the arm at the horizontal signalling "danger", or do not proceed. Examples of this form of signalling system survive at Kuranda Station. At night, lights were necessary, and kerosene lamps with movable coloured spectacles displayed different colours, including green (proceed), yellow (prepare to find next signal red), and red (stop). To coordinate signals so that it is impossible to give a "clear" signal to a train unless the route is actually clear, the signals could be interlocked. An interlocked yard is a railway yard where semaphore or coloured light signals are controlled in such a way that the signals will not allow a train to proceed unless the points that operate in conjunction with the signals are correctly set. A mechanical