824 Application Advice
American Association of Railroads (AAR) · X12 008010
American Association of Railroads (AAR)’s published 824 specification, rendered as an interactive guide. Expand any segment to see its elements, data types, lengths and accepted codes — then validate your own document against it below.
Specification
14 of 14 segments
HEADING
ST
Transaction Set Header ST
pos 0100
Optional
max —
BGN
Beginning Segment BGN
pos 0200
Required
max —
DETAIL
OTI LoopOTI Loop Transaction Set Acceptvariant 1 of 2
OTI
Original Transaction Identification OTI
pos 0100
Required
max —
REF
Reference Information Interchange Train Identificationvariant 1 of 2
Occurs one (1) time for Train ID
pos 0200
Required
max —
REF
Reference Information Section Numbervariant 2 of 2
Occurs one (1) time for Train ID
pos 0200
Required
max —
DTM
Date Time Reference DTM Htdvariant 1 of 2
pos 0300
Required
max —
DTM
Date/Time Reference Tenant Train Departurevariant 2 of 2
pos 0300
Required
max —
OTI LoopOTI Loop Transaction Set Rejectvariant 2 of 2
OTI
Original Transaction Identification OTI
pos 0100
Required
max —
REF
Reference Information Interchange Train Identificationvariant 1 of 2
Occurs one (1) time for Train ID
pos 0200
Required
max —
REF
Reference Information Section Numbervariant 2 of 2
Occurs one (1) time for Train ID
pos 0200
Required
max —
DTM
Date Time Reference DTM Htdvariant 1 of 2
pos 0300
Required
max —
DTM
Date/Time Reference Tenant Train Departurevariant 2 of 2
pos 0300
Optional
max —
TED Looprequired
TED
Technical Error Description TED
pos 0700
Required
max —
SE
Transaction Set Trailer SE
pos 0900
Optional
max —
Validate a 824
Paste or upload a document and check it against American Association of Railroads (AAR)’s published rules — segment order and repetition, required elements, field lengths, data types and accepted codes. Nothing is stored.
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