They're pretty high-density double-deckers too, with an underslung\r\nlower deck. Double-decking largely doubles carrying capacity.
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US DD systems are fairly common -- the rolling stock on both the\r\nChicago Metra and Peninsula Cal-Train are identical. While there are\r\ntwo levels to the trains, the top decks are sort of "mezzanine" style.\r\nBenches are three-seaters below, but only single-seaters above, so the\r\ncapacity boost is only about 25% for the higher set of seats.
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