I'm a large lad so I'll push the button and stand right in the middle of the door so no-one can barge past. If theres someone slap bang in front standing on the platform and I can't safely step down I'll stand on the train and look at them. They soon move.
That works as a conductor trying to follow the company rule of stepping onto the platform before releasing the doors, too.
The ones that really get my goat are those that try and get on a terminating train before it's emptied out. The train coming in forms their outward train, but they have to sit in 'their' seat as it's where they always sit. Hundreds trying to get off, and a few selfish f***wits trying to get on.
The ones that also annoy me are those that sprint down the platform with seconds to spare, because their station exit is at the front of the train, so that is where they will board. There could be a horde of flesh eating locusts coming in to attack, but that is where they must board and leave, and by god, that IS where they will board and leave. They usually have the obligatory suit and trainers on.
Plus those that turn up as you're given the tip to shut the doors with a cup of coffee in each hand and enough luggage to fill the hold of a jumbo jet, then look at you accusingly because you've DARED to depart on time.
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Shoes on seats - if they are younger, generally a stern look will do it. I'm quite a big imposing bloke (6ft and 18 stone) and the younger ones take my stern look as "shift them or I'll eat you" I think. For the older sorts, I'll generally go with something like "I'd be careful having your feet on the seats, the last guy that did that had really dirty boots on", with a look of distaste on my face. Confuses the hell out of them but usually has the desired effect.