SNCF 141.R.420 & 231.K.8, Langeac, Tues 3 May 2005 - 1031. The Mediterranean Steam Express reached Langeac one hour late at 1023 but left two hours late at 1128 because of having to wait for a northbound train to clear the single track section. The Cevennes mountain section starts at Langeac. From here the line climbs 510 metres to the 1025m summit at La Bastide - Saint Laurent, 19km south of Langogne. The gradient over the 86km between Langeac and the summit reaches 1.8% (1 in 56). The southern approach to the summit is much steeper, with gradients up to 2.5% (1 in 40). The line is single track, with 106 tunnels and many more bridges and viaducts.