To indicate the start of a transaction set and to assign a control number
20
SSC
Beginning Segment for Service Commitment Advice
To transmit identifying numbers, dates, and other basic data relating to the transaction set
To specify any or all of a date, a time, or a time period
To identify a party by type of organization, name, and code
To specify carrier and routing sequences and details
To identify the origin and destination of a shipment
60
PI
Price Authority Identification
To communicate basis of pricing, such as contract number, quote number, or tariff number
To identify the commodity to which the application of a rate docket is restricted
Used to limit the application of restrictions to a subset of standard Association of American Railroads Car Type Codes
90
APR
Association of American Railroads Pool Code Restrictions
Used to limit the application of restrictions to a subset of standard Association of American Railroads Pool Codes
100
SHR
Railroad Interline Service Special Handling Restrictions
To identify the special handling codes that apply to a shipment
110
SR
Requested Service Schedule
To identify requested service schedules
To reference a line number in a transaction set
120
ISD
Railroad Interline Service Definition Detail
To identify service commitment starting events
130
ISC
Interline Service Commitment Detail
To identify the service commitment schedules
To indicate the end of the transaction set and provide the count of the transmitted segments (including the beginning (ST) and ending (SE) segments)