 The Board of Trade were asked to carry out the necessary formal inspection to approve passenger working, but the proposed method of operation, by telegraph and block system, was not considered safe for passenger operation on a single line.A further inspection in March 1865 noted that the terminus station at Brynamman was to be on a gradient of 1 in 57, an arrangement also considered unsafe, and authorisation was again postponed.Authorisation for passenger working on the Llanelly line was given on 20 March 1865; it is not recorded how the considerable gradient easement was achieved.