1) Jack 2) Laborer 3) Labourer 4) Manual laborer 5) Railway occupation 6) Tracklayer 1) Tracklayer 
A platelayer (British English) or trackman (American English) is a railway employee whose job is to inspect and maintain the permanent way of a railway installation. The term derives from the plates used to build plateways, an early form of railway. == Track inspection == Inspecting and maintaining the track, including all its component parts such...
[n] - a workman who lays and repairs railroad tracks
tracklayer noun a workman who lays and repairs railroad tracks