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All answers having "train" as clue:

3 Character Answers:

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TAX



4 Character Answers:

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LINE

PREP

RAIL

SPAR

TAIL

TREN



5 Character Answers:

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COACH

EXACT

LOCAL

SUITE

TEACH

TUTOR

WAGON



6 Character Answers:

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ESCORT

SCHOOL



7 Character Answers:

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BREAKIN

EDUCATE

NURTURE

PREPARE

RETINUE



8 Character Answers:

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CHOOCHOO

EXERCISE

SEQUENCE



9 Character Answers:

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ENTOURAGE



10 Character Answers:

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FRIENDSHIP



11 Character Answers:

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TEACHASKILL

TEACHSKILLS



14 Character Answers:

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MAKEGOODEWESOF