First test is 21 questions based on situational judgement. The way you answer these questions will then dictate what questions you get asked at the multi modal interview. The next three tests are computer based. First one is looking at a flashing dark grey box and hitting a green button when it changes to black. It's a very noticeable change and don't make the mistake of thinking it starts flashing black it won't it will be dark grey. This test lasts for 30 minutes. The next one is the picture memory test where a street scene ( America based) flashes up where you are to remember what you seen in the very brief time it appears. You are looking for Traffic signs, pedestrians, traffic lights, scooters bicycles and motorcycles finally motor vehicles. 16 slides and for most this is quite tricky. Don't guess just answer with what you see. Final test is the two had coordination where you use two joysticks to navigate a red ball around a simulated track one joystick controls lateral movement the other vertical movement.The track shape remains the same and speed and accuracy are of equal importance. You will be unable to keep the ball within the track at all times just correct as quickly and efficiently as soon as it departs. Should you pass these tests you will then be given 6 questions which you have time to prepare answers. For example but not specifically they are like "give me an example when you've had to take control of an emergency situation"
Answer all these 6 questions using the STAR method and you can use non work related scenarios to answer. It's also important to remember the role of a driver and couch your responses in a manner that demonstrates you have or previously had the qualities and attributes that would make a good train driver. They will definitely ask probing questions which is nothing to be alarmed by.
Regards
Kev