The swastika was certainly used pre Nazi era. My (admittedly erratic) memory says it was an egyptian symbol of the sun-god. But more recently it was the trade mark of the swedish electrical company ASEA (which became part of ABB), who built this amazing room. Legend has it that this was only saved by the lads 'at the sharp end', ie the electrical technicians on the railway (when maintenance was still in house and the 'railwayman' community was a lot stronger), creating a fuss, otherwise it would have been partially gutted and left to decay, like the other examples, some of which are still in use as store-rooms.