PT Problem of the Day: How are Siemens train seats consistently the dirtiest on the system?

POTD: Siemens train seats

Of all the trains, trams and buses in Melbourne, it does seem that the blue Siemens train seats are consistently the dirtiest. Some have been upgraded to a multi-coloured design that seems cleaner (or at least looks cleaner), but many carriages still have this blue design that so often puts people off.

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