I see that Northern have put a notice on their careers page. Due to the take over this Sunday (1st March) when their association with Arriva comes to an end, they will no longer be recruiting on the Deutsche Bahn site.
You cannot actually access the Northern careers page anymore, but you can still access the DB site for careers with Cross Country & Grand Central. When you log on that way, there are still Northern jobs advertised if you do a full search of Arriva TOC roles.
The update from Northern is not 100% clear. I get the impression anyone who has recently applied for anything (going through the paper sift) is snookered - it's game over and you will have to applying for the same job when it is re-advertised once Northern are back up and running with the operator of last resort at the whelm.
It doesn't make it clear what will happen to people who have actually been through assessments, medicals, interviews, talent pools, etc and are more advanced through the recruitment cycle (i.e. If they applied months ago for the role!). The notice seems to imply HR staff will make contact with people in due course.
It must be very frustrating for anyone caught up in this and potentially suffering a knock back. I don't recall there being any issues with the Virgin/Avanti change over in December and people being advised to reapply for jobs.
CJ