Milepost

But beyond these cut-offs, to avoid the wholesale alteration of all mileposting and mileages—of bridges and culverts, for example—the original mileposts have remained unaltered.

[...] the 4 miles at 1 in 180 up to Sanquhar were mounted with no greater fall in speed than from 65 to 59 m.p.h., after which, possibly as a result of easing the engine or because the strain on steam supply was beginning to tell, the final 3½ miles up at 1 in 200 up to milepost 59½ were surmounted at a minimum of 49½ m.p.h.