I’ve been with SE for a a year and a half now, and it certainly is a life changing career, all I’d say regarding DMI to be honest, is the only company information they kind of expect is general knowledge of the company, I.E, where SE operates, such as Kent, London and East Sussex, how many stations, ammount of staff, this can ALL be found on SE main website on information.
They don’t expect you to know what the company’s structure is and anything to do with depots, all they are testing is you have put in the effort to research the company, MEMORIse The TPWS sheet, as they literally tick off how much info you retain and give back to them (memory test)
Other then that,have a good reason for wanting the job, not “I want the responsibility” an answer as simple as I think driving trains would be awesome (my answer I gave) is more honest and truthful, they want no bs, and to make sure your for for the job,
So again, don’t go in there with an overload of information regarding how the company operates and what it’s been up too recently unless you seriously understand it, as stuff like that can open you up down a road you don’t know the rest of the answers too,
Hope you do well, don’t stress, be honest and learn some bits, they will teach you the rest.