7775, 7860 and 7782 are passing Horrem (on Cologne-Aachen) with mixed freight
train 44521 from Antwerpen-Noord to Gremberg (marshalling yard in Cologne) on
5 February 2008. A close look shows that 7775 and 7782 have transmitters for the
German train protection system PZB (mounted at the rear bogies on the left
side), but 7860 has none. As the number of locos equipped with PZB is limited,
the triple headings for the trains towards Gremberg normally consist of two such 
locos and one without PZB in between.
<p>
Digital photo by
<a href="http://www-users.rwth-aachen.de/christoph.schmitz2/index.html">Christoph
Schmitz</a>
(<a href="mailto:christoph.schmitz2@post.rwth-aachen.de">christoph.schmitz2@post.rwth-aachen.de</a>)