The Wolverhampton–Shrewsbury line is the railway line from Wolverhampton to Shrewsbury via Wellington; it was originally built by the Shrewsbury and Birmingham Railway. The line is double track throughout, with rarely used relief sidings at Cosford and four tracks through Wellington station. Electrification from Stafford Road Junction to Oxley, is provided solely to enable electric stock to access Alstom's Oxley TRSMD, and is therefore constructed as a "trolley wire" suitable for low speeds only.