Continuing this series here are six more prototype railroading terms:

Junction
Where two or more railroad lines converge as designated by the Timetable.

Main Track
A track where train movements are authorized by ABS, DCS, or interlocking as designated by the Timetable.

Maintenance of Way
A location where work is being carried out by Railroad Crewsas designated by Form D. Abbreviated as MOW or MW.

Marker
A highly visible red/amber light, reflector flag, or marking device on the rear of a train.

Mile Post
A white sign with black numbers to designate the distance from a location. Abbreviated as MP.

Movable Point Frog
A frog with a moving alignment allowing open flangeway for train movement.