The Clue
Fuel for old locomotives (4 letter answer)
The Answer
COAL
Tags
Notes
The answer COAL is seen frequently, appearing about once every 150 puzzles.
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Definition
COAL as a noun:
1. fossil fuel consisting of carbonized vegetable matter deposited in the Carboniferous period
2. (ember, coal) = a hot fragment of wood or coal that is left from a fire and is glowing or smoldering
COAL as a verb:
1. (char, coal) = burn to charcoal; "Without a drenching rain, the forest fire will char everything"
2. supply with coal
3. take in coal; "The big ship coaled"