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Wouldn't it be more accurate to say that quantifying the energy contained in
the object is subject to your choice of frame? Choosing a frame doesn't
require a system of objects necessarily. In the case you cite above, for
example, it seems to me that the train itself is irrelevant, only the frame
chosen is a determining factor. If that IS the case, then there is still
nothing wrong with asserting that WHATEVER the quantity of kinetic energy
calculated may be, it is STILL "contained" in the object. Yes? No?