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Very interesting puzzle! Thanx a lot!
Please be so kind and correct the designation of the bus to "Simmeringer", not ""Semmeringer".
The "Semmering" is an Austrian mountain, about 60 miles south of Vienna. "Simmering" the eleventh district of Vienna, the settlement of the company.
This business location still exists until today with "SIEMENS SGP Verkehrstechnik Ges.m.b.H." there.