To indicate the start of a transaction set and to assign a control number
200
BTS
Beginning Segment for Train Sheets
To transmit identifying symbols, loads, empties, weights, lengths, horsepower, and related data
To specify information about a specific event
250
N9
Extended Reference Information
To transmit identifying information as specified by the Reference Identification Qualifier
270
H3
Special Handling Instructions
To specify special handling instructions in coded or free-form format
To identify the direction the equipment is facing
To identify the type or transmission or both of paperwork or supporting information
450
PER
Administrative Communications Contact
To identify a person or office to whom administrative communications should be directed
500
NM1
Individual or Organizational Name
To supply the full name of an individual or organizational entity
To specify pertinent dates and times
To indicate the end of the transaction set and provide the count of the transmitted segments (including the beginning (ST) and ending (SE) segments)
