The gap between a pair of adjacent railway tracks, where they are running in opposite directions. The actual distance can be anything up to twelve feet depending how fast the trains run, but it's always called a sixfoot.

Standing in the sixfoot is like standing on the lane-marker of a road; you shouldn't get hit when a train passes, but you'll be really close.
We were working in the sixfoot when the ballast gave way under us and I fell into the fourfoot - good job my mate pulled me clear before the train came.
by po8crg June 08, 2016
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