Where alterations to train running is required, a draft Train Alteration Advice (TAA) is issued.
Further consultation / engagement will take place when required.
Where alterations impact an interfacing network, the Possession Team will liaise with the relevant network stakeholders.
Agreed alterations will be amended in TRIMS. The formal notification of an approved PossessionRequest is the publication of a TAA and will be published 2 to 4 weeks prior to works commencing.