| Answer | Crossword Clue |
|---|---|
| GAUGE | Distance between the rails of a railroad. |
| GAUGE | Distance between rails. |
| GAUGE | Distance between rails |
| SPAN | Distance between the wing tips of a plane. |
| LINE | A straight one is the shortest distance between two points |
| AXIOM | "A straight line is the shortest distance between two points," for instance. |
