Fantastic new offices to work in. Culture of excellence. Some expectation that you do work related development in your own time. Variety of regular office social events.
Unofficial flexible working hours. You can vary your start time within reason but must complete your daily hours each day and not work over during the week to take a shorted day at the end.
Learn as much as you can about Rail before the interview. Be sure to talk about the sector of the business you want to work in most - Project Management, Track, Signalling etc. As you will end up working in this sector if you pass the interview and it is difficult to change.