railhead

noun

1. 1.A point on a railway system where goods are loaded, unloaded or transferred to other transport.
2. 2.The furthest point on a railroad/railway under construction to which rails have been laid.
3. 3.The top surface (head) of a rail.
4. 4.An area of hostile territory at the end of a rail line that, when captured, serves for the continuous movement into position of further troops and material.