Another six common railway terms with simple definitions:

Foreman
The person in charge of a Roadway Crew. He or she is authorized to control train traffic (designated by a Form D) through a section of trackage obstructed or undergoing repair. Abbreviated as Frm.

Form D or Movement Permit Form D
A form issued by the Dispatcher containing written authorizations, restrictions, or instructions.

Form D Control System
A block system (signalled or non-signalled) for the movement of trains outside of yard limits as authorized by a Form D. Abbreviated as DCS.

Frog
The “X” shaped portion of a switch. A Frog can also an tool used for rerailing car wheels.

General Order
A document used to detail Timetable or other changes. Abbreviated as GO.

Head Man
Is a freight train brakeman who rides in the locomotive cab.