There is a programme "How Britain Worked" coming up on Sun 21/10/2012 from 20:00 to 21:00 on Channel 4
The summary reads:
"Engineering enthusiast Guy Martin ....... begins by overhauling a steam locomotive currently in use on the Severn Valley Railway, repairing its boiler, safety valves and one of its two-ton wheels. He also lays some track using the same methods as the notorious `navvies' - the notorious, hard-living labourers who laid Britain's entire railway infrastructure by hand.".
This is part 1 of a series of 6 programmes.