The M&CR was incorporated in 1837 to connect the two towns of Carlisle and Maryport. George Stephenson was the engineer of the line, which first opened on February 10, 1845. In due course the total length of railway was 42.75 miles.
The C&WJR was incorporated in 1876 and the line between Workington and Cleator Moor was opened in 1879. The line continued northwards from Workington to a junction with the LNWR at Siddick, about two miles away. A second main line was built from a junction on the C&WJR main line at Calva Junction to Linefoot Junction, where it joined the Maryport and Carlisle Railway. This section was known as the Northern Extension.
The C&WJR was incorporated in 1876 and the line between Workington and Cleator Moor was opened in 1879. The line continued northwards from Workington to a junction with the LNWR at Siddick, about two miles away. A second main line was built from a junction on the C&WJR main line at Calva Junction to Linefoot Junction, where it joined the Maryport and Carlisle Railway. This section was known as the Northern Extension.