4 foot
A commonly used term for `between the rails' (UK standard gauge being
4 foot 8½ inches).
6 foot
Commonly used term for the space between two adjacent tracks.
7 year overhaul
Steam locomotives working on the National Network are required to undergo
thorough boiler examinations
every 7 years.
10 year overhaul
Steam locomotives working on independant railways are usually required to
undergo thorough boiler examinations
every 10 years, although this may sometimes be extended.