| Answer | Crossword Clue |
|---|---|
| MARKERS | Signals at the rear of a train. |
| caboose | car for the crew at the rear of a train |
| helpers | extra locomotive attached to a train at the front, middle, or rear, esp. to provide extra power for climbing a steep grade |
| helper | extra locomotive attached to a train at the front, middle, or rear, esp. to provide extra power for climbing a steep grade |
| frequency | The particular waveband at which a radio station or other system broadcasts or transmits signals |
| frequencies | The particular waveband at which a radio station or other system broadcasts or transmits signals |
