Train Activation

Overview

The Train Activation message is used to link a 10-character unique train identity to a schedule. This unique identity is used in all other message types to refer to the train.

Unique identities are guaranteed unique only within a calendar month, as the final two digits are the day of the month in which the train ran.

Linking a schedule to a unique identity

Schedules are uniquely identified by UID, start date and STP indicator. The activation message has three fields - 'train_uid', 'schedule_start_date' and 'schedule_type'. To find the schedule that a train is running to, look these up in your timetable database.

Auto and Manual Call

Internally, the activation process is known as 'calling', and a train may be called in one of two ways:

• The majority of schedules are set up as Auto Call. Activation messages will automatically be sent for them around an hour before the scheduled departure time.
• Some schedules are set up as Manual Call where a train may operate more than one schedule - usually a freight train which has three timetables available with different destinations, but will only run to one specific one depending on demand on the day.

There is no difference in handling Auto and Manually called trains.

Data structure

Header

Field	Description
msg_type	Set to '0001' for an activation message
source_dev_id	Always blank for an activation message
source_system_id	Set to "TRUST" for an activation message
original_data_source	Set to "TSIA" for an activation message

Body

Field	Description
schedule_source	Set to 'C' for CIF schedules, or 'V' for VSTP schedules
train_file_address	Always blank
schedule_end_date	The end date of the schedule as per CIF or VSTP
train_id	Set to the 10-character unique identity for this train, and will appear in other TRUST message types
tp_origin_timestamp	?
creation_timestamp	?
tp_origin_stanox	STANOX of the originating location, but may be nil
origin_dep_timestamp	Scheduled departure time
train_service_code	Train service code as per schedule
toc_id	Operating company ID as per [TOC_Codes]
d1266_record_number	'00000' represents a CIF schedule, any other value indicates a VSTP schedule
train_call_type	'AUTOMATIC' for trains which are auto-called, or 'MANUAL' for trains which are manually called (e.g. run-as-required)
train_uid	Schedule UID being activated. Either a letter and five numbers for a CIF schedule, or a space and five numbers for a VSTP schedule where the numbers are the same as the d1266_record_number field
train_call_mode	Always set to 'NORMAL'
schedule_type	One of 'C', 'N', 'O', 'P'
sched_origin_stanox	STANOX of the originating location. May not be nil
sched_wtt_id	Working Timetable (WTT) identifier - the train reporting number with either '1', '2', '3', '4', 'C', 'M', 'N' or 'O' appended
sched_start_date	The start date of the schedule