What about route learning how many routes do you have to learn? With so many signals and routes wouldn't it be easy to go the wrong way
This is definitely something worth asking in the interview. "What routes would I sign as a driver at this depot?"
Though, it may also be impressive if you could find out beforehand and drop it in conversation. "I'm told this depot signs [x, y and z] is that right?" Shows you've done your homework.
With regard to route learning in general, yes I'd say that's the most important part of the training. Driving trains is easy, it's stopping them (and knowing where to stop) that's hard. You have to know every station platform length and stop marks, every signal and the route indications it can show (and which ones you can take), line and junction names and speeds, name and type of level crossings, gradients, landmarks (such as the names of foot crossings and overbridges), tunnel names and lengths, all the possible shunt movements (including ones you'll do once in a decade) and most importantly where all the toilets and coffee places are.
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One of the best questions in my eyes which I like to ask is "is there any reason why you think I'd be unsuccessful to getting to the next stage"
I wouldn't ask this. It puts them on the spot to say something positive since people don't generally like to give negative feedback face to face.
If at the end of an interview I feel it's gone well and I'd like to take the job if offered, I say something like "It sounds like I could get on pretty well here. What will be the next step in the process and what kind of timeframe should I expect?"
Their response will say it all. If they seem enthusiastic, volunteering lots of information about exactly how many people they're seeing and when they'll forward their recommendations to HR, that's good news for you. If they avoid eye contact and give you some quick waffle, that doesn't bode well.
If it turns out you're not successful and you want feedback, the interviewers generally (in my experience) forward their notes to HR, so you can discuss it with them afterward.