EMUs are usually needed in Suburban Areas where the "Standing Population" inside a coach is very important and it is comfortable to stand for long periods without disturbing others, such is their design.
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With MEMUs, the "Standing Population" is not very important and it is not comfortable to stand for long distances, as it is uncomfortable and may block the path of moving passengers and vendors.
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MEMUs in Suburban Sections can be tried out with Super Locals (HWH-BWN-HWH via Main and Chord both) or with other long-distance Locals having less halts.