id	description	section	req	max_loop	max_usage	pos
BRR	Beginning Segment For Railroad Mark Register Update Activity	H	M	0	1	1
DTM	Date/Time Reference	H	M	0	10	2
N1	Party Identification	H	M	25	1	3
N2	Additional Name Information	H	O	0	1	4
N3	Party Location	H	O	0	2	5
N4	Geographic Location	H	O	0	1	6
PER	Administrative Communications Contact	H	O	0	1	7