IC 690 "Hohenstaufen"
On September 26, 1971, the German Federal Railroad (DB) introduced its new service "InterCity 71" and hit the bull's eye with it. First class Intercity trains now ran in a rigid system of four lines that were served at more or less two-hour intervals. The really special feature of the IC system was (and is still today with the ICE/IC system) in the linking of the lines with direct transfer possibilities on the same platform. This thus provided a large coverage effect: Dortmund and Cologne offered transfer possibilities between Lines 1 and 2, in Mannheim trains for Lines 1 and 3 waited for each other, in Würzburg the trains for Lines 2 and 4, and in Hannover the trains for Lines 3 and 4. Due to the great success the DB then decided at the start of the summer schedule for 1979 on May 27 to introduce hourly service with mixed class trains on all four IC lines with the slogan "Jede Stunde – jede Klasse: der "IC 79" / "Every Hour – Every Class: the "IC 79". All of the junction points remained in effect. Block trains was the new magic expression and all IC trains thus ran with blocks of cars in 1st and 2nd class, separated by a dining car or a Quick Pick car. It was pure "chance" that the routes for the lines were set up such that the same car classes stood opposite each other at the junction stations.
This multitude of new trains naturally required names also, and the venerable "Hohenstaufen" thus became the godfather of a pair of Intercity trains. IC 690/691 "Hohenstaufen" ran in the following years between Munich and Hamburg-Altona via Stuttgart, Heidelberg, Mannheim, Frankfurt/Main, and Hannover. The class 103.1 locomotives functioned as motive power. As a rule, they had to pull eight cars in 2nd class (5 Bm 3 Bpm), a dining car, and three cars in 1st class (2 Avm,1 Apm).
The train name "Hohenstaufen" remained in use until the end of 2001. From 1991 on an ICE bore this name, running on the same route. Then came a downgrade, because from 1999 on there was only an InterRegio between Karlsruhe and Lindau (in 2001 Karlsruhe – Ulm) with this designation that was full of history.