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FRA Guide for Preparing Accident/Incident Reports
Appendix J - 2 Instructions for Type of Territory
Block 30 on Form FRA F 6180.54
These systems are variously identified in the industry as:
1. Track Warrant Control (TWC)
2. Direct Traffic Control (DTC)
3. Form D Control System (DCS)
4. Occupancy Control System (OCS)
5. Manual Block System (MBS)
_______________
(Note: these could all be considered stand-alone methods of operation and may be shown as
such.)
FRA Guide for Preparing Accident/Incident Reports
Instructions for Type of Territory Appendix J - 3 Block 30 on Form FRA F 6180.54
Type of Territory for Main Track
Position 1 Position 2 Position 3 Position 4 Position 5
Method of Operation/
Signalization Authority for Movement Supplemental Codes Supplemental Codes Supplemental Codes
1 - Signaled 1 - Signal Indication A - Auto Cab Signals A - Auto Cab Signals A - Auto Cab Signals
B - Auto Train Control B - Auto Train Control B - Auto Train Control
C - Auto Train Stop C - Auto Train Stop C - Auto Train Stop
D - Automatic Block Signals System D - Automatic Block Signals System D - Automatic Block Signals System
G - Interlocking G - Interlocking G - Interlocking
J - Positive Train Control J - Positive Train Control J - Positive Train Control
L - Special Instructions L - Special Instructions L - Special Instructions
Q - Traffic Control System/CTC Q - Traffic Control System/CTC Q - Traffic Control System/CTC
R - Yard/Restricted Limits R - Yard/Restricted Limits R - Yard/Restricted Limits
Z - Other – Narrative Required Z - Other – Narrative Required Z - Other – Narrative Required
1 - Signaled 2 - Direct Train Control A - Auto Cab Signals A - Auto Cab Signals A - Auto Cab Signals
B - Auto Train Control B - Auto Train Control B - Auto Train Control
C - Auto Train Stop C - Auto Train Stop C - Auto Train Stop
D - Automatic Block Signals System D - Automatic Block Signals System D - Automatic Block Signals System
F - Direct Traffic Control F - Direct Traffic Control F - Direct Traffic Control
G - Interlocking G - Interlocking G - Interlocking
J - Positive Train Control J - Positive Train Control J - Positive Train Control
L - Special Instructions L - Special Instructions L - Special Instructions
N - Time Table/Train Orders N - Time Table/Train Orders N - Time Table/Train Orders
P - Track Warrant Control P - Track Warrant Control P - Track Warrant Control
R - Yard/Restricted Limits R - Yard/Restricted Limits R - Yard/Restricted Limits
Z - Other – Narrative Required Z - Other – Narrative Required Z - Other – Narrative Required
FRA Guide for Preparing Accident/Incident Reports
Instructions for Type of Territory Appendix J - 4 Block 30 on Form FRA F 6180.54
Type of Territory for Main Track - Continued
Position 1 Position 2 Position 3 Position 4 Position 5
Method of Operation/
Signalization Authority for Movement Supplemental Codes Supplemental Codes Supplemental Codes
2 - Non Signaled 2 - Direct Train Control F - Direct Traffic Control E - Broken Rail Monitoring E - Broken Rail Monitoring
H - Manual Block System F - Direct Traffic Control F - Direct Traffic Control
J - Positive Train Control H - Manual Block System H - Manual Block System
L - Special Instructions J - Positive Train Control J - Positive Train Control
N - Time Table/Train Orders L - Special Instructions L - Special Instructions
P - Track Warrant Control M - Switch Point Monitoring M - Switch Point Monitoring
Z - Other – Narrative Required N -Time Table/Train Orders N - Time Table/Train Orders
P -Track Warrant Control P -Track Warrant Control
Z - Other – Narrative Required Z - Other – Narrative Required
2 - Non Signaled 3 - Yard/Restricted J - Positive Train Control E - Broken Rail Monitoring E - Broken Rail Monitoring
Limits L - Special Instructions J - Positive Train Control J - Positive Train Control
Z - Other – Narrative Required L - Special Instructions L - Special Instructions
M - Switch Point Monitoring M - Switch Point Monitoring
Z - Other – Narrative Required Z - Other – Narrative Required
2 - Non Signaled 4 - Block Register J - Positive Train Control E - Broken Rail Monitoring E - Broken Rail Monitoring
Territory Z - Other – Narrative Required M - Switch Point Monitoring M - Switch Point Monitoring
Z - Other – Narrative Required Z - Other – Narrative Required
FRA Guide for Preparing Accident/Incident Reports
Instructions for Type of Territory Appendix J - 5 Block 30 on Form FRA F 6180.54
Type of Territory for Other than Main Track or Siding Track to Include Yard Track and
Industry Track
Position 1 Position 2 Position 3 Position 4 Position 5
Method of Operation/
Signalization Authority for Movement Supplemental Codes Supplemental Codes Supplemental Codes
1 - Signaled 5 - Other Than Main Track G - Interlocking G - Interlocking G - Interlocking
(Standard Rule 105 L- Special Instructions L - Special Instructions L - Special Instructions
or Equivalent) Z - Other – Narrative Required Z - Other – Narrative Required Z - Other – Narrative Required
2 - Not Signaled 5 - Other Than Main Track K - Restricted Speed or Equivalent L - Special Instructions L- Special Instructions
(Standard Rule 105 L - Special Instructions Z - Other – Narrative Required Z - Other – Narrative Required
or Equivalent) Z - Other – Narrative Required
FRA Guide for Preparing Accident/Incident Reports
Instructions for Type of Territory Appendix J - 6 Block 30 on Form FRA F 6180.54
Type of Territory for Siding Track
Position 1 Position 2 Position 3 Position 4 Position 5
Method of Operation/
Signalization Authority for Movement Supplemental Codes Supplemental Codes Supplemental Codes
1 - Signaled 1 - Signal Indication A - Auto Cab Signals A - Auto Cab Signals A - Auto Cab Signals
B - Auto Train Control B - Auto Train Control B - Auto Train Control
C - Auto Train Stop C - Auto Train Stop C - Auto Train Stop