still in stock at the end of 1928: a third-class coach, withdrawn in 1930; and a brake van (used as a breakdown van), withdrawn in 1948. Goods vehicles (mainly coal): 629. By 1913, the line carried nearly 3.5 million long tons a year of coal and 227,000 long tons of other minerals. The main workshops for locomotives, carriages and wagons were at Machen; it was open by 1863, and was reconstructed in 1875. The works was about half a mile east of Machen station on the northern side of the line (). Although overhaul of the whole rolling stock fleet was carried out there, new construction was confined to wagons, including the three "market vans". One locomotive, no. 25, part-built by Robert Stephenson & Co., was completed at Machen during 1898. After the Grouping, the GWR rationalised the workshops inherited from the various railways of South Wales, and the Caerphilly works of the former Rhymney Railway was selected for enlargement. The work was completed in 1926, and Machen works, just a few miles to the north-east, was then closed. Traffic managers and general managers Alfred Henshaw, 1863 – 1894. John Gall 1894 – 1903. Herbert R. Price 1903 – 1922. Locomotive Superintendents John Thomas Simpson: 1863 – 10 June 1869 (killed in accident at Maesycwmmer) Thomas Mason: 1869 – November 1871 (resigned) Charles Long: January 1872 – May 1888 (retired) George C. Owen: 1888 – 18 April 1909 (killed in accident at Machen) James Dunbar: 1909 – February 1922 (died in office) Following the death of Dunbar, the post remained vacant until the GWR absorbed the B&MR locomotive stock on 1 July 1922. During this period, H. F. H. Gibson, the chief draughtsman, was in charge of the B&MR locomotive department. Topography The Pontsarn viaduct is long and height, whilst the Cefn Coed (or Pontycapel) viaduct is long with a height of . Torpantau tunnel through the Beacons was long. At an elevation of , it was the highest railway tunnel above sea level anywhere in Britain. Exiting from south-east portal of the tunnel, the line descended for along a 1:38 (2.6%) gradient by the side of Glyn Collwyn and the (later: 1931) Talybont reservoir. Talyllyn tunnel was situated at the west end of the former Talyllyn station, about to the east of Brecon. It is long, and was originally built in 1816 for the Hay Railway. Location list, Brecon