ÖBB 1042 506-4 with train E 1952 "Erlebniszug Zauberberge" (Mürzzuschlag - Wien) at Mürzzuschlag. 
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Historic cars (including a dining car) are used for some regular trains on the Semmering due to the anniversary "100 years Semmering line". Normally those trains are pulled by an ÖBB 1010, but this loco wasn't available on 2004-01-31.
"Erlebniszug Zauberberge" trains: Wien 8:25 Südbf - Mürzzuschlag 10:55/11:56 - Wiener Neustadt 13:21 /13:40 - Mürzzuschlag 14:57/15:56 - Wien Südbf 18:33.
There are also through cars Wien - Gutenstein and Wien - Puchberg am Schneeberg.
The trains operate on Saturdays, Sundays and public holidays untill 2004-12-11 and may be used with normal tickets.

Photo: Helmut Uttenthaler, Graz - Austria; helmut.uttenthaler@gmx.at