Crawshaw Woods Bridge. Crawshaw Woods Bridge (also known as Shippen Lane Bridge) is a grade II listed cast iron overbridge which spans the Leeds to Selby railway line between  and  railway stations. It is notable for being the oldest railway associated iron bridge still in daily use on an operational railway. Due to an upgrade to the line which runs beneath it, the abutments of the bridge will be raised by , and then the iron arch re-installed at a new height to accommodate electric overhead wires underneath.

History 
The bridge, which is between Cross Gates and Garforth railway stations, was designed by James Walker, and engineered by Stanningley Ironworks for the Leeds and Selby Railway in 1834. Most of the other bridges on the line were constructed of stone, but Crawshaw Woods Bridge is a cast iron bridge  set into stone abutments on either side of the line. It is thought that the ground underneath the bridge would not support the weight of an all stone structure, so a "single-span, segmental-arched bridge with wrought iron railing balustrades and curved mushroom-top stone piers" was placed there instead. The bridge was renewed by the LNER in 1943 (when a timber deck was installed above the original surface, making the structure non-loadbearing) and it was also renovated by Railtrack in 1999. It was strengthened in 2006 by Network Rail. The bridge spans a gap of  and has three segmental ribs, each  deep, and is largely cast iron, but the supporting materials are sandstone, wrought iron, steel and concrete. The added deck structure has metal panelling along its length, which one report describes as "unsympathetic".

The overbridge was designed to stretch over four lines, but in the event, only two lines were built on the line and these are closer to one side of the bank with the other side being piled up with earth. As the tracks are slewed to one side, the track in the middle is  below the arch, and the other track is  below the arch. The bridge is too low to accommodate the overhead line equipment for the electrification of the line as part of the Transpennine Route Upgrade, so it will be raised by . The structure will be jacked up at a cost of £3.7 million (as opposed to an entirely new deck structure at £1.4 million), this is deemed to be a better financial alternative to the option of lowering the track, which is estimated to cost £14.6 million (2024 prices). Work will also be undertaken on the road deck of the bridge, which sits atop the iron-arch structure. This has solid-steel parapets which stand clear, and are structurally independent of, the bridge.

The bridge was grade II listed in 2015, being hailed by Historic England as a "..testament to one of the "Victorian's greatest achievements" - railways." The bridge carries a public bridleway over the railway, and is also used by agricultural traffic. During the First World War, it was used by workers to get to the Barnbow munitions factory on the north side of the line. Therefore, it is of historical interest due to its association with Barnbow, and it being the oldest cast iron bridge still in-situ over a working railway in the world.

The bridge has the numbered designation of HUL 4/20 on the British railway's engineer's line reference system, being nearly  east of  railway station, and  west of .

See also 
Listed buildings in Leeds (Cross Gates and Whinmoor Ward)

Notes

References

Sources

External links 
TRU news article

Bridges completed in 1834
Bridges in West Yorkshire
Grade II listed buildings in West Yorkshire
Grade II listed bridges
1834 establishments in England