id	description	section	req	max_loop	max_usage	pos
SSC	Beginning Segment For Service Commitment Advice	H	M	0	1	1
DTP	Date Or Time Or Period	H	M	0	2	2
N1	Party Identification	H	O	0	999999	3
R2	Route Information	H	O	0	13	4
OD	Origin And Destination	H	O	0	1	5
PI	Price Authority Identification	H	O	0	10	6
PR	Product (Commodity)	H	O	0	99	7
CT	Car Type	H	O	0	99	8
APR	Association Of American Railroads Pool Code Restrictions	H	O	0	99	9
SHR	Railroad Interline Service Special Handling Restrictions	H	O	0	99	10
SR	Requested Service Schedule	H	O	7	1	11
LX	Transaction Set Line Number	H	O	999999	1	12
ISD	Railroad Interline Service Definition Detail	H	O	0	15	13
ISC	Interline Service Commitment Detail	H	O	0	999999	14