The Whitby, Redcar and Middlesbrough Union Railway (WRMU), a.k.a. the Whitby–Loftus Line, was a railway line in North Yorkshire, England, built between 1871 and 1886, running from Loftus on the Yorkshire coast to the Esk at Whitby, and connecting Middlesbrough to Whitby along the coast. For much of its journey the line hugged the cliffs, and had a troubled build due to the proximity to the sea and poor quality of the construction on many of its original bridges and viaducts. The line was closed to passengers in May 1958, but the northern section to Boulby Potash Mine re-opened in the 1970s.
