The dates when the Pacers in service with Northern will be released have been published as part of the Northern franchise agreement by the government:
https://www.gov.uk/government/uploa.../file/537465/northern-franchise-agreement.pdf (pages 147 - 148)
Class 142 release profile
10 vehicles released 10.11.2018
38 vehicles released 08.12.2018
18 vehicles released 05.1.2019
20 vehicles released 02.2.2019
16 vehicles released 02.3.2019
2 vehicles released 31.3.2019
10 vehicles released 27.4.2019
4 vehicles released 25.5.2019
12 vehicles released 22.6.2019
8 vehicles released 20.7.2019
8 vehicles released 17.8.2019
8 vehicles released 14.9.2019
4 vehicles released 12.10.2019
(Total vehicles released: 158)
Class 144 (2-car) release profile
10 vehicles released 15.9.2018
4 vehicles released 13.10.2018
8 vehicles released 10.11.2018
4 vehicles released 5.1.2019
(Total vehicles released: 26)
Class 144 (3-car) release
The intention of the Franchisee is that these units will be released on 31 March 2019.
Also, the FGW franchise agreement from last year has GWRs 143s and 153s as going off lease May - July 2017.
https://www.gov.uk/government/uploa...a/file/486668/red-fgw-franchise-agreement.pdf (pages 143 & 144)
Should the WG be telling Angel and Porterbrook now that it wants the 143s and 144s when they become available, and possibly even the 142s to cover for 143s and 144s whilst they are away having DDA mods, to prevent a real capacity crisis on the Valley lines in 2018 - 2020?