The King Edward VII Bridge south-west of the station opened on 10 July 1906 allowing north–south trains to continue without reversing. The two bridges enable the trackwork north and south of the river to form a complete circle, allowing trains to be turned if necessary. The former Gateshead depot, next to the connecting tracks on the south side of the Tyne, mirrored Newcastle station. The station was noted for its complex set of diamond crossings to the east of the station which facilitated access to the High Level Bridge and northbound East Coast Main Line and was said to be the greatest such crossing in the world. The crossing was the subject of many early-1900s post cards, titled The Largest Railway Crossing in the World, photographed from the castle (towards the station), or from the station towards the castle. The crossing has been simplified in recent years as the opening of the Metro brought about the withdrawal of many heavy-rail suburban services and the closure of the bay platforms they operated from on the north side of the station removing the need for such a complex crossing. Much of this work was carried out in 1988–1989 as part of remodelling and resignalling work associated with ECML electrification. A new island platform on the former goods lines was commissioned as part of this work, with signalling control relocated to the Tyneside IECC on the opposite side of the river. Heaton depot is to the north of the station, on the East Coast Main Line. Accidents and incidents On 17 August 1951, two electric multiple units experienced a head-on collision after one of them departed against a danger signal. Two people were killed. On 19 April 1955, a collision occurred between V2 locomotive 60968 and Fairburn tank locomotive No. 42085 on the diamond crossings. Both locomotives were derailed. On 3 July 1961, there was a significant fire inside the station building. The fire, having started in a cable duct at the peak of rush hour, saw the station's new signalling system put out of operation, delaying main line trains. Nearly 10,000 square foot of the station's roof was destroyed, but luckily no one was hurt. Tyne & Wear Metro Newcastle station is located above Central metro station on the Tyne and Wear Metro, one of five underground stations serving the city centre. Central is an interchange between the Yellow and Green lines,