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15 July, 10:50

Gravel, crushed rock, cinder-these are used as ballast on railroad beds.

correct

incorrect

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  1. 15 July, 11:12
    0
    Correct.

    The rule in this case is that it sets apart this set of words as an introduction to the sentence. Dashes also may be used to set apart as a conclusion. See the reverse:

    These are used as ballast on railroad beds - gravel, crush rock, cinder.
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