Chester station, last Saturday night, arriving on the 1844 from Llandudno, crowds of people obviously off clubbing (Warrington? Manchester?) being held back from the platform edge by G4S staff as we ran in. As soon as the train stopped the security men vanished and the mob just rushed for the doors, where, of course, their way was blocked by quite a few people waiting to get off. Definite 'shoulder action' ensued but only after someone had shouted 'let us off first, please' to be greeted by some half wit demanding to be let through 'because he had a baby'. So we looked and he did. He was stood, with a baby in the very middle of a mass of people who were halfway off their faces already, knocking him from side to side but still apparently convinced that the people trying to get off would part magically so he, alone, could get on.
As for doors, I must confess to a slight error earlier in that day. Most, if not all Northern trains that I use regularly have the 'Open' button at the top. I arrived at Colwyn Bay on an ATW Class 175. We stopped, the buttons lit up and I pressed. After a few seconds, the woman behind me sighed, reached beneath my arm and pressed the other button. Thus did I discover that ATW 175s (and some, but NOT all ATW158s, from personal observations) have the 'Open' button at the bottom.