Siemens S-Bahn unit RABe 514 027-2. That is the number of
the entire train, consisting of the RAe 514 127-0 + 
B 514 227-8 + BS 514 327-6 + RBe 514 427-4 (here seen in
front).
Zürich HB Sihlpost track 51, 2013-08-22.
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<a href="mailto:tbk.uncia@gmail.com">tobias b k&ouml;hler</a>