That is possibly the most insulting thing I have read in my entire life. Plus you certainly have mis-interpreted as that is not what I was getting accross at all. Watch what you say!
You've clearly never been insulted by anyone who meant it then. Your interest in rail operations is one thing, but you really do seem to be very good at picking up anything deviant in what the traincrew do and checking to see if its breaking the rules.
What I think you sometimes don't always realise that a change in the crew's behaviour doesn't necessarily mean that they are breaking the rules - rules change, policy - as you've seen - varies between depots, and, very occasionally, people do break the rules.
I wouldn't worry about where they do the doors from, I'd more worry about the strange guy in casual clothing, hanging around on the platform in a yellow hi-vis with a whistle round his neck on a football lanyard. Or the signal that wasn't reset to danger after a train passed it - those are things, in my mind, that smack of something being wrong and might be worth mentioning.