Assertion: conductor's train | /r/CapableOf | block main set of tracks
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Source sentences:
text: If, or maybe I could more accurately say when, a train wreck occurred, or when a train was required to stop for some unusual reason, and would be blocking the main set of tracks, the Flagman's job was to set flares and warning devices along the track in the direction of any expected train, then they were to station themselves at a visible point as far down the tracks as possible to be able to warn any oncoming train of the dangers ahead.