This X12 Transaction Set contains the format and establishes the data contents of the Estimated Time of Arrival and Car Scheduling Transaction Set (421) for use within the context of an Electronic Data Interchange (EDI) environment. This transaction set can be used to allow railroads to exchange car scheduling and estimated time of arrival data between carriers.

Table 1
	pos.no	seg.id	name	req.des	max	loop.rep
	0100	ST	Transaction Set Header	M	1
	0200	IS1	Estimated Time of Arrival and Car Scheduling	M	1
	0300	N9	Extended Reference Information	M	5
	0350	ISC	Interline Service Commitment Detail	O	>1
	0400	N8	Waybill Reference	O	1
	0500	IS2	Scheduled Events	M	>1
	0700	F9	Origin Station	O	1
	0800	D9	Destination Station	O	1
	0900	N1	Party Identification	O	10
	1100	R2	Route Information	O	13
	1200	L5	Description, Marks and Numbers	O	5
	1300	H3	Special Handling Instructions	O	6
	1400	H5	Car Service Order	O	1
	1500	IC	Intermodal Chassis Equipment	O	1
	1600	IMA	Interchange Move Authority	O	1
	1700	PS	Protective Service Instructions	O	1
	1800	REF	Reference Information	O	10
	1900	N8A	Additional Reference Information	O	25
	LOOP ID - S1					12
	2000	S1	Stop-off Name	O	1
	2100	S9	Stop-off Station	O	1
	2200	LS	Loop Header	O	1
	LOOP ID - LH1					1000
	2300	LH1	Hazardous Identification Information	O	1
	2400	LH2	Hazardous Classification Information	O	4
	2500	LH3	Hazardous Material Shipping Name Information	O	10
	2600	LFH	Free-form Hazardous Material Information	O	20
	2700	LEP	EPA Required Data	O	3
	2800	LH4	Canadian Dangerous Requirements	O	4
	2900	LHT	Transborder Hazardous Requirements	O	3
	3000	LHR	Hazardous Material Identifying Reference Numbers	O	5
	3100	PER	Administrative Communications Contact	O	5
	LOOP ID - N1					10
	3120	N1	Party Identification	O	1
	3140	N3	Party Location	O	2
	3160	N4	Geographic Location	O	1
	3180	PER	Administrative Communications Contact	O	2
	3200	LE	Loop Trailer	O	1
	3300	PER	Administrative Communications Contact	O	5
	3400	SE	Transaction Set Trailer	M	1