traffic was operated using locomotives based at three sheds in the monmouthshire area: abergavenny, tredegar and blaenavon. until the closure of the line, services were operated by lnwr webb coal tanks, of which some 55 were allocated between the three sheds in 1919, with abergavenny receiving 37, tredegar 14 and blaenavon 4. as late as 1950, there were still 14 in the area, of which no. 58926 headed the last train in 1958. before the coal tanks, lnwr special tanks were active on the line from 1877 to 1921. when the line became part of the london, midland and scottish railway (lms) on the grouping, l&nwr locomotives were not superseded by lms ones and the first only appeared in 1936 when lms stanier 2-6-2t no. 79 arrived. however, it was only after the second world war when numbers increased with the allocation of several lms ivatt class 2 2-6-2ts to tredegar.