120.122 emerged from the Mühlener Tunnel on the descent from the Gäu into the Neckar Valley east of Horb. The loco was working IC187, the 13:56 from Stuttgart Hbf to Zürich HB on 31 May 2012.
The Gäu is a plateau region south of Stuttgart and gives its name to the Stuttgart - Singen railway, known as the Gäubahn.