An activation message is produced when a train entity is created from a schedule entity by the TRUST system. The train entity refers to a single run of a train on a specific day whereas the schedule entity is potentially valid for several months at a time. Within TRUST, this process is known as Train Call. Most trains are called automatically (auto-call) before the train is due to run, and there is no specific event which triggers the call. The exception to this is for schedules which are Runs as required, or Runs to terminals/yards as required (flagged with Q or Y in the schedule.) By default, it is assumed that the train will not run unless the train operator decides that it will; the train operator will submit a message to the TRUST system and this will then cause the schedule to be activated for that day (a process is known as manual call.)
Train activations are usually received 1 - 2 hours before the train is due to run, but these trains may be manually called earlier if some details of the train are due to change.
|msg_type||'0001' for an activation message|
|source_dev_id||Always blank for an activation message|
|source_system_id||"TRUST" for an activation message|
|original_data_source||"TSIA" for an activation message|
|train_id||The 10-character unique identity for this train
This is used in other TRUST messages to identify the train. The train activation message links the train_id with a particular schedule. train_id is of the format nnHHHHsXXX where:
|creation_timestamp||The timestamp (in milliseconds since the UNIX epoch) when the train was originally created in TRUST|
|tp_origin_timestamp||The date, in YYYY-MM-DD format, that the train runs. For trains activated before midnight that run after midnight, this date will be tomorrow's date.
Note: there is currently a problem with the tp_origin_timestamp field due to the truncation of the timestamp. This only occurs during daylight savings for trains which start their journey between 0001 and 0200 the next day. To work around this problem, use the date in the origin_dep_timestamp field.
|train_uid||The unique ID of the schedule being activated - either a letter and five numbers, or a space and five numbers for VSTP trains|
|sched_origin_stanox||STANOX code for the originating location in the schedule|
|schedule_start_date||The start date of the schedule|
|schedule_end_date||The end date of the schedule|
|schedule_source||Set to C for schedules from CIF/ITPS, or V for schedules from VSTP/TOPS|
|schedule_type||Either C (Cancellation), N (New STP), O (STP Overlay) or P (Permanent i.e. as per the WTT/LTP)|
|schedule_wtt_id||The signaling ID (headcode) and speed class of the train|
|d1266_record_number||Either 00000 for a CIF/ITPS schedule, or the TOPS unique ID of the schedule|
|tp_origin_stanox||The STANOX code of the origin of the train
If the train is due to start from a location other than the scheduled origin (i.e. it is part-cancelled), this will be the STANOX of the location at which the train starts. Otherwise it is the STANOX of the scheduled origin location. If this field is populated, it will be typically be in response to a VAR issued through VSTP or SCHEDULE.
|origin_dep_timestamp||The WTT time of departure from the originating location. A UNIX timestamp in milliseconds since the UNIX epoch, in UTC.|
|train_call_type||Either AUTOMATIC for auto-called trains, or MANUAL for manual-called trains|
|train_call_mode||Set to NORMAL for a train called normally, or OVERNIGHT if the train is called as part of an overnight batch process to activate peak period trains early|
|toc_id||Operating company ID as per TOC Codes|
|train_service_code||Train service code as per schedule|
|train_file_address||The TOPS train file address, if applicable|
Linking with Schedule Data
The train activation message is the only message type which directly links a signalling ID to a schedule. There are ways to infer this relationship using other data, but it is much more difficult.
An individual schedule is identified by the unique schedule identifier (train_uid) and the schedule start date (schedule_start_date). These will identify one or more schedules from the SCHEDULE data feed. If there are several schedules that have the same start date, then the one with the lowest STP indicator character is the valid one. Note: at present, there seems to be a bug in the schedule_type field which does not always match the schedules available in the SCHEDULE feed.
See the how scheduling works page for more details.
|Network Rail Open Data Feeds|
|Data Feeds||About the Feeds • Account States • Durable Subscriptions • Example Code ( PHP / C# / Java / Ruby / Node.js) • Advanced Uses • FAQ • Release Notes|
|Train Movements||Train Movements Feed • Train Activation • Train Cancellation • Train Movement • Train Reinstatement • Change of Origin • Change of Identity • Change of Location • TSPEED Field • Planned Cancellations • Cancellation Codes|
|TD||TD Feed • C-Class Messages • S-Class Messages • Train Describers • TD Berths|
|TSR||TSR Feed • Route Codes|
|SCHEDULE||SCHEDULE Feed • Schedule and Location Records • Association Records • CIF Codes • How Scheduling Works • Allowances|
|Reference Data||Reference Data Feed • TOC Codes • CIF Codes • Delay Attribution Codes • Identifying Locations (STANOX, TIPLOC, NLC and 3-Alpha Codes) • STANOX Geographical Areas • Train Planning data|