 The LNWR was a constituent of the new London Midland and Scottish Railway group (LMS); the Great Western Railway absorbed numerous smaller concerns but continued in the same identity as before.The LMS closed the Llanmorlais branch passenger service on 5 January 1931 and total closure of the branch followed on 2 September 1957.Emlyn colliery on the Mountain branch closed about 1947 and the upper part of the branch fell into decline; the branches serving collieries were almost entirely dependent on the mining, and when that declined and moved away, the branches suffered accordingly.