Railway Signaling and Radio Codes

Radio Codes and Fixed Automatic Signals

• Fixed Automatic Signal displaying a Green aspect: Proceed at the allowable speed, expecting the next signal to be clear.
• Fixed Automatic Signal displaying a Yellow aspect: Proceed with caution, be prepared to stop at the next signal.
• Fixed Automatic Signal displaying a Red aspect: Stop 15 feet short of the signal or at the yellow Insulated Joint (IJ) marker on the third rail protection board, call OCC immediately.
• Fixed Automatic Signal displaying a Red aspect with an “AK” Authorized Key-By sign: Stop 15 feet short of the signal, bridge the Insulated Joint with the first set of wheels, and STOP, proceed with Restricted Speed and Extreme Caution to the next signal.

Fixed Interlocking Approach Signals

• Fixed Interlocking Approach Signal displaying a Red aspect with a Lunar White (on Grade Time): Approach at the allowable speed, expecting this signal to clear.
• Fixed Automatic Signal displaying a Red aspect with a Lunar White (on Grade Time with a Countdown Timer Aspect): Approach at the allowable speed, expecting this signal to clear, an aspect will count down to zero when grade time is in effect.
• Fixed Interlocking Standard Home Signal displaying a Red over Red aspect with a Lunar White (on Grade Time): Approach at the allowable speed, expecting this signal to clear.

Fixed Interlocking Approach Signals with Illuminated Letters

• Fixed Automatic Signal displaying a Yellow aspect with an illuminated “S” (on Grade Time): Approach at the allowable speed, expecting the next signal to clear.
• Fixed Interlocking Approach Signal displaying a Yellow aspect with an illuminated “S” (on Grade Time): Approach at the allowable speed, expecting the next signal to clear.
• Fixed Interlocking Approach Signal displaying a Yellow aspect with an illuminated “D” (on Grade Time): Approach at the allowable speed, expecting the next signal to clear for the diverging route.

Fixed Interlocking Standard Home Signals

• Fixed Interlocking Standard Home Signal displaying a Yellow over Green aspect with an illuminated “S” (on Grade Time): Approach at the allowable speed, expecting the next signal to clear, continue on the main route.
• Fixed Interlocking Standard Home Signal displaying a Yellow over Yellow aspect with an illuminated “S” (on Grade Time): Approach at the allowable speed, expecting the next signal to clear, train operators must not move the train until the signal at the leaving end is a proceed signal.

Fixed Miscellaneous Signs

• Fixed Miscellaneous – Station Car Stop Sign: Located within station limits to indicate the position where trains of all lengths must stop.
• Fixed Miscellaneous – Full Height Station Car Stop Sign: Located within station limits to indicate the position at which trains of all lengths must stop, to make a precise stop.
• Fixed Miscellaneous - J/Z Skip Stop Signs: Installed in skip stop areas to alert Train Operators of train stopping patterns.
• Fixed Miscellaneous – OPTO Station Car Stop sign: Located within station platform limits to indicate the position at which the first car of the train in OPTO service must stop regardless of train length.
• Fixed Miscellaneous – Radio Frequency Sign: Located near station car stop signs and conductor indication boards to indicate a radio frequency changeover point.
• Fixed Miscellaneous – Stop Sign: Located at the entrance to maintenance facilities, at crosswalks in yards, and in certain other areas, train operators must stop the train and then proceed in accordance with special instructions.
• Fixed Miscellaneous – Lay Up Car Stop Sign: Indicates the position at which designated trains are to be stored, the number denotes position.
• Fixed Miscellaneous – Employee Loading Platform Sign: Designates where a train must stop, when signaled to do so, in order for the first door of the first car of the train to be abreast of the employee platform.
• Fixed Miscellaneous - Station Platform Telephone T Sign: Located in a station to indicate the location of a system telephone.

Fixed Miscellaneous Lights

• Fixed Miscellaneous Light – Wheel Detector (WD Start Lighted Steadily): Entering Wheel Detector Area, adjust speed and expect a diverging route.
• Fixed Miscellaneous Light – Wheel Detector (WD Middle Lighted Steadily): Complying with previously posted speed, adjust to posted speed.
• Fixed Miscellaneous Light – Wheel Detectors (WD Middle Flashing): Adjust to posted speed, the light will stop flashing and illuminate steadily when the train operator complies with previously posted speed.

Fixed Miscellaneous Signs and Lights

• Fixed Miscellaneous – WD End Sign: Indicates that a maximum length train has cleared a wheel detector area and permissible speed for the track section may be resumed unless otherwise restricted.
• Fixed Miscellaneous Light – Train Order Signal: Located near the entrance to under river tunnels or bridges, at stations where gap fillers are in operation, and at certain other locations, 2 horizontal red lights indicate stop and stay, call the OCC by radio or telephone for instructions.
• Fixed Miscellaneous – End of Signal Control Sign: Located at the end of signal control system to indicate that operations will be governed by RESTRICTED SPEED AND EXTREME CAUTION unless otherwise indicated.
• Fixed Miscellaneous – Fouling Point Sign: Defines the clearing point at HAND OPERATED switches, cars or other equipment must not pass on the connecting track while cars occupy any portion of the track between the Fouling Point Sign and the switch.
• Fixed Miscellaneous Light - Switch Target: Indicates the location of a hand throw switch or derailer.
• Fixed Miscellaneous – Shop Door Clearance Sign: Defines the shop door open clearance point, cars or other equipment must not attempt to pass through the doorway until the bottom edge of the door has been raised above the clearance sign.
• Fixed Miscellaneous - Route Display Sign: Located at the end of the platform near the station car stop sign or along the right of way to alert the train operator of the home signal aspect that he/she must look for to stay on the appropriate route.
• Fixed Miscellaneous Light - Train Identification / Route Request Button: Used in conjunction with certain home signals to permit train operators to identify their trains or to make route requests to the tower operator.