when required to move at restricted speed, all movements must be made at a speed which allows for stopping half of the range of vision, short of: Trains, Engines, Railroad cars, men or equipment fouling the track, stop signal, or derail or switch lined improperly. When movement is made at restricted speed, the crew must keep a lookout for broken rail and not exceed 20 MPH.
a length of track that no train is permitted to enter while the track is occupied by another train.
A block or interlocking signal without a number plate, or designated by an "A" marker.
a length of track:
between consecutive block signals
between a block signal and the end of a block system limits
In ATC limits the use of which is governed by cab signals and/or block signals
Automatic Block Signal System (ABS)
A series of consecutive blocks governed by block signals, cab signals, or both. The signals are activated by a train or by certain conditions that affect the block use.
A system of tracks, other than main tracks and sidings used for making up trains, storing cars and other purposes.
A portion of main track designated by yard limit signs and timetable special instructions or a track bulletin.
On or more engines coupled, with or without cars, displaying a marker and authorized to operate on a main track.
A unit propelled by any form of energy or more than one of these units operated from a single control. Engines are used in train or yard service. Rules that apply to engines also apply to cab control cars.
Dual Control Switch
A power-operated switch, moveable point frog, or derail that can also be operated by hand.