There were numerous trains running between Ost und West. My favorite, because I rode it often through the Ruhr from Duisburg to Gelsenkirchen (last train on a Sunday night) was the Ost-West Express. There's a page for it at http://vonderruhren.de/aachenbahn/seiten/ostwest.php starting in 1980. I rode it from 1985-1988. There are several more listed at http://vonderruhren.de/aachenbahn/seiten/intern4_1.php. Did a search on google and came up with a few things using "interzonenzug," including this entry at http://de.wikipedia.org/wiki/Interzonenzug. There was also a thread on Stummi's Forum at http://stummi.foren-city.de/topic,7767,-zugbildung-fuer-interzonenzug-1968-1973.html on the subject.

Rio Grande has two videos on the subject:

image Mit der 01.5 zum Eisernen Vorhang - http://www.riogrande.de/dvddetails.php4?filmrubrik=12&artikelnummer=3002

image Auf den Spuren der Interzonenzüge - http://www.riogrande.de/dvddetails.php4?artikelnummer=6072

I have the former and it is quite good in showing typical compositions.

Also numerous images in the Eisenbahn Journal issues devoted to the DB in the 70s and 80s. See http://www.eisenbahn-journal.de/ for more details.

All can be ordered through VGBahn, http://www.vgbahn.de that markets them. They take credit cards and are great to deal with. Their email is bestellung@vgbahn.de.

Hope this helps,

Peter