There are three types of allowance that may be added to a timing point location for a train.
This is extra time to allow for a speed restriction on the railway.
It may also be called 'Box Time', as the Working Timetable encloses engineering allowances in a box or square brackets.
This is extra time to ensure the train path doesn't conflict with others at a junction, or where trains running at different speeds are operating over a route.
It may also be called 'Circle Time', as the Working Timetable encloses pathing allowances in a circle or brackets.
This is extra time to provide a margin or buffer for late running on a day-to-day basis.
It may also be called 'Diamond Time', as the Working Timetable encloses performance allowances in a diamond or angle-brackets.
|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 • 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|