DynamicSpirit
Established Member
Bags placed on seats (very often to dissuade others from sitting adjacent);
Aisle seat sitters when the window seat is empty (prevalent on buses as well as trains), meaning others have to ask, and get the sitter to move, before they can take a seat. Often with bags placed on the window seat too, for the same reason as above.
I wouldn't necessarily assume the bags on seats are to dissuade others from sitting there. If there is space, I often put my bag on the seat next to mine because that way I can get to it easily. And if doing that on a commuter train where people are frequently getting on/off, I may sit in the aisle and put my bag on the window seat for security: Much harder for anyone to steal the bag if I'm sitting between it and everyone else! Of course, if the train starts to get full so it looks like someone may need the seat, then I'm very proactive at getting ready to move the bag to make way for them. If someone doesn't do that, then you might be more justified in assuming they are primarily trying to claim both seats.
(EDIT: Should clarify that I use the Elizabeth line a lot. The transverse seats on those trains are set facing each other (but without a table) - not airline style, which means it's much more normal and a bit less of a faff for someone to take a free window seat next to an occupied aisle seat).
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