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In March 1847, the Blackburn, Darwen and Bolton Railway Co and the Blackburn, Clitheroe and North Western Junction Railway Co agreed to amalgamate, becoming the Bolton, Blackburn, Clitheroe and West Yorkshire Railway; the necessary Act received Royal Assent on 9 July 1847.
The line opened from Bolton to Blackburn on August 12th 1848, and from Blackburn to Chatburn on June 22nd, 1850. 
The name was shortened to the Blackburn Railway' by a further Act of 24 July 1851.