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These days all pins are lifted from the bottom, but in the past, they were lifted from the top.  I recall back in the 1960s, there was a mixture, but most lifted from the bottom even back then.  I do not know why they changed from top-lift pins to bottom-lift pins.  Engine couplers lift from the top (do all of them?  I'm not sure), but I don’t think that coupler at the top of the photo is an engine.  It looks like a car from what shows of it.  If it is in a museum, it could very easily be a top-lift pin on an older antique car.  I believe all couplers that lift from the bottom have that little plate tac-welded to cover the opening for a top pin.  Apparently they make all couplers with that hole for top-lifting pins, and then cover the hole if they don't use it.  I cannot explain why engines often, if not always, use a top-lift pin.  I never thought about it before.  I don’t know of any cases where they would permanently lock a coupler closed.  If they want that kind of connection, they replace the couplers with a solid drawbar pinned to each car.
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