The bridge is a late 19th century and essentially unmodified high level road-rail bridge with half-through double by 2 lattice girder approach spans and hogback through double x 2 lattice girder main spans.
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The two single tracks from Duckmanton South Junction to Duckmanton East Junction were lifted between Autumn 1963 and February 1965 and the lattice girder flyover was subsequently removed, though it survived at least until February 1965.
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A train travelling from South to East would turn West ( left ) at Duckmanton South Junction, climb on a single track arc and cross the GC Main Line from southwest to northeast using a lattice girder bridge.
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These elements comprise the top and bottom reinforcement mesh, sized to suit the specific project, joined together with vertical lattice girders with the void formers trapped between the top and bottom mesh reinforcement to fix their optimum position.
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The large span lattice girder bridges over Saltmarket, London Road and Gallowgate, and the elevated viaduct sections there and near Cumberland Street are reminders of an ambitious scheme to connect the north and south railway networks in the city.
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Two of the three bridges over the Spey still survive : the joint road / rail cast-iron arch bridge at Carron and the impressive lattice girder bridge at Ballindalloch, the latter is now a Category A listed building.
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Holbrook No . 1 Colliery was situated immediately west of the Midland's GCML as far as its lattice girder overbridge over the Midland's Old Road, after which it ran parallel to the Old Road to the colliery.
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The Fabre lattice girders were replaced by conventional spars, the single interplane struts replaced by more conventional paired struts and the tail surfaces altered to a cruciform arrangement, with the rudder divided into two sections above and below the stabiliser.
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Its design incorporating a 100-foot lattice girder span supported on timber piers is similar in concept to bridges on the original Ipswich to Toowoomba line, opened in 1867, but on which all such bridges have long been removed.
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The lattice girders which tie the towers together are cased with more ornamental iron work bearing the date of the erection of the bridge, 1889 and underneath the ironwork appears the inscription The gift of Michael Arthur First Baron Burton.
