Spessartrampe

This is a really cool video about pusher operations on the Spessartrampe between Laufach and Heigenbruecken on the busy main line between Aschaffenburg and Wuerzburg.
The German Wikipedia article gives much more complete information than the English version.

This will be history soon as newly built tunnels will make the trip over the hill obsolete. Note how highspeed, local passenger, and freight trains share the same tracks on this section...