First stage was a short written test after which you get invited back for a scenario based interview where you get told if you pass onto the next stage pretty much straight away. At both the stages everything was clearly described.

3 online screening tests, 1 in-person assessment centre, Role-play interview and a final standard interview. Must pass each stage to move on to the next. The online tests give results within a week, the assessment centre within 2 weeks, role-play interview on the same day. The whole process from application to final interview can take several months. Plenty of details online, especially in railway forums.

Online Scenario Assessment, Timed Logic, Maths and English Assessments, In Person Role Play and Scenario Based Interview. Tested on knowledge of London Tube Map/Zones and Ticket Options. Long Process but explained clearly throughout.