| Answer | Crossword Clue |
|---|---|
| STEAM | Power source for early engines |
| STEAM | Early auto engine's power source |
| FUEL | Energy source for engines |
| STEAM | Power source for Fulton |
| FEET | Power source for the Flintstones' car |
| CBATTERY | Power source for a toy, often |
| THIRDRAIL | Power source for a subway train |
| STARBOARDENGINE | Source of power for many boats |
| METEOR | Power source for the first Green Lantern |
| HIPS | Source of power for a golf swing |
