Not saying these will happen, but they are due (or overdue) under franchise agreements/other previously announced commitments:
Thameslink:
- Second hourly Camb-Brighton via core, other additional services originally expected to be added by May 19 deferred until unspecified date (see post 5479 here
https://www.railforums.co.uk/threads/thameslink-services-timetable-from-may-20th.164547/page-183)
GA:
TSR2 enhancements are:
- Hertford East 2TPH to 3TPH off peak only
- Southend Vic 3TPH to 4TPH off peak only
- Norwich Cambridge hourly extended to Stansted Airport all day
- LivSt Ipswich hourly semifast extended to Norwich all day
- introduction of STAR
(personally I dont expect any of these to happen other than STAR and possibly some Norwich Camb through to Stansted)
GWR:
- half hourly service Pz-Ply
- 4TPH Padd-Bristol
(but given nothing detailed published on these yet assume they are not happening in May?)
Scotrail
- enhanced highland mainline
https://www.tactran.gov.uk/documents/4GSSPHMLProjectandTimetableDev.pdf
- post electrification improvements - I'm not sure what is due when but presumably they will speed up various central belt services?
SouthWestern
- 4TPH to Windsor/Reading all day
- 4TPH Portsmouth direct (using 442s)
Northern / TPE
After the franchises were awarded there was a nice doc entitled "Summary of Committed Timetable Changes" published which says in first paragraph "The majority of the changes will take place at the December 2017 timetable change, with all committed improvements in place from December 2019. TransPennine will also implement a timetable change in December 2018 as part of its build-up of new services".
The links to that doc are now broken. Anyone know if TPE/Northern are committed to any particular enhancements in May?
WMT/LondonNorthWestern
Various improvements were due Dec 18 but deferred cus of the NR timetabling mess, believe these have been bid for May 19, see
http://moderngov.staffordshire.gov.uk/documents/s99107/Appendix A for West Midlands Rail Briefing Report.pdf
Changes include:
- extra TPH New Street - Shrewsbury stopper running via Aston and Bescot
- each of the three hourly Euston - New Street via Northampton services extended, one to Liverpool (fast Stafford to Crewe), one to Crewe via Stoke and one to Rugeley via Walsall
- second hourly Liverpool - Birmingham NS extended to International
- hourly Euston to Crewe to run direct from Stafford to Crewe not via Stoke
- Leamington/Cov and Cov/Nuneaton combined