There will be industrial action by the TSSA union on London North Western Railway and West Midlands Railway on 22 and 23 May.
The ONLY services to run, and then only from 0700 to 1900 are
LNWR-
hourly Birmingham to Liverpool;
hourly Birmingham to Euston via Northampton, stopping pattern not confirmed
West Midlands Railway- 2 trains per hour Lichfield to Redditch/Bromsgrove;
hourly Rugeley to Birmingham International; hourly Wolverhampton to Walsall via Birmingham.
This means no fast service to Watford Junction (use the slow Overground trains) and little if any service to Bletchley.
For Bletchley, if the station is closed, use Avanti to Milton Keynes Central then bus or taxi.
Journey planners are not currently up to date.
Trains that do run are likely to be very busy, and may be short formed.