| GAUGE | Distance between the rails of a railway track |
| SLEEPER | One of a series of wooden beam-like structures supporting the rails of a railway track (7) |
| NARROWGAUGE | Of a railway track, having less than the standard 1.435m distance between the lines (6,5) |
| CAROM | Bounce off the rail of a pool table |
| STAMDARDGAUGE | Of a railway track, having a distance of 4ft 8.5 in (1.435 m) between the lines (8,5) |
| STANDARDGAUGE | Of a railway track, having a distance of 4 ft 8 inches (1.435 m) between the lines (8,5) |
| SPAN | Distance between the tips of one's thumb and little finger; the wingspread of an aircraft or bird; a stretch of time, as in concentration or life etc; or, the arch of a bridge (4) |
| CUSHIONS | Bumpers on the rails of snooker tables from which the balls rebound; or, the air-filled sections supporting hovercrafts (8) |
| RAILCAR | A wheeled vehicle adapted to the rails of railroad. |
| CAR | A wheeled vehicle adapted to the rails of railroad (3) |
| RAIL | Continuous steel bar or line forming part of a railway track (4) |
| SIDING | Short offshoot of a railway track |
| RADIUS | A solar ___ is a unit of measurement equivalent to the distance between the centre of the Sun and its visible surface |
| LINE | A railway track; a wrinkle; a very narrow stripe; or, a rope such as a guy for a tent or a sheet for a sail (4) |
| HOBO | Drifter riding the rails of old Americana |
| METRE | One ten-millionth of the distance between the North Pole and the equator (as defined by the French Academy of Sciences in 1791) |
| POST | Rail of a fence |
| ACTION | The distance between the strings and the fingerboard of a guitar (6) |
| BANISTER | The "rail" of "raillery" is in (8) |
| ELL | Obsolete unit of length, originally the distance between the elbow and tip of the middle finger |
