Is this the end of the tank?

Featured in The Telegraph

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We’re hitting the limit of how protected you can make a platform without making it too large or heavy to to fit on civilian infrastructure,” says Dr Jack Watling at defence think tank Royal United Services Institute (RUSI). “There are limits to how creative you can be. They have to be narrow enough to t on a railway car, which limits how long they can be, because for tracks to turn they have to be on specific proportions, with a length about 1.4 times the width. The constraints on tank design were basically decided in the 19th century by someone working out how to t a horse and cart on a train.