Block system, automatic. A series of consecutive blocks governed by block signals actuated by a train or engine or by certain conditions affecting the use of the block.
Block system, manual. A series of consecutive blocks, governed by block signals.
Block System
A system of railroad tracks divided into short sections or blocks, usually three or four miles in length, which will permit trains to be run by signal apparatus so that no train can enter a block until the preceding train has left it.
A block system that uses blocks signal indications to authorize train movements.
Center Sill ...
Manual Block System
A series of consecutive blocks, governed by block signals operated manually, using information by telegraph, telephone or other means of communication.
Marker ...
Automatic Block System
A series of consecutive blocks governed by block signals, cab signals, or both, actuated by a train or engine, or by certain conditions affecting the use of a block.
Automatic Brake Valve ...
Manual Block System A system where an area of trackage used to operate trains in both directions on a single track that is not controlled automatically through a signaling system.
Block A length of track between consecutive block signals or from a block signal to the end of block system limits, governed by block signals, cab signals or both.
In earlier Conrail days that used manual block system rules. When the NORAC rulebook came into being MBS was replaced with form D rules. The form D is akin to a track warrant.
Automatic Block System, or Automatic Block Signal (ABS)
RAILWAYS. A train control system. I believe that ABS is a relatively primitive system compared with CTC and CTS.
Automatic Route
RAILWAYS. See "Fleeting".
Trains in the exhibit operate on a DC block system rather than the more modern DCC mode many railroad modelers have adopted.
ORANGE = supply to the circuit - BLUE = signal wire from block - YELLOW = common of circuit and block system.
The LEDs indicates a train detection. The output is optoisolated.
The individual circuit boards were left attached for ease of installation.
We common folk with block systems have our own easy "THINK SMALL" solution. If your railroad has fifteen blocks or the whole railroad is just one block your roundhouse tracks and turntable are probably wired like Figure C.
or where no office exists by another railroad employee; when giving the train passed the station or office; when restricting a work extra or annulling an order authorizing a work extra; and, when temporarily discontinuing Automatic Block System.
 See also: Track, Train, Switch, Block, Engine
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