Jenny Agutter narrates this two-part documentary, aired on BBC Four, that follows steam enthusiasts as they strive to restore traditional steam engines and railway lines. The steam network, so crucial in establishing Britain as an industrial powerhouse and for transporting goods during WWI and WWII, fell into disrepair and disuse in the second half of the 20th century as the technology was superseded by more modern forms of travel. However, a number of steam romantics have dedicated themselves to preserving narrow gauge railways and the programme pays testament to their efforts.