Term: ten-foot (railroads)
an area, usually at least ten feet wide, between a pair of widely-spaced tracks, wide enough to form a place of safety in which railwaymen can stand while a train goes past. See also four-foot and six-foot.
View pictures relating to railroads at Wisconsin Historical Images.
[Source: "Rail terminology" at Wikipedia (http://en.wikipedia.org/wiki/Rail_terminology)]