This accounts for the tight curves along some sections of the track, as those parts of the line had been designed with tram, not subway standards.

The western part of U1 represents the third rail-based corridor on a nigh-identical alignment between the neighboring cities of Nuremberg and Fürth since 1835.

First the Bavarian Ludwig Railway (locally often metonymically identified with its locomotive the Adler) which shut down in 1922 in the face of German hyperinflation and after competition from a parallel tram line became to fierce.

Further plans for expansion towards a station tentatively named "Kieselbühl" are no longer seriously pursued by political actors in Fürth, meaning the line has reached what appears to be its permanent length for the time being.

Shortly after the Brunecker Straße, the track reappears on the surface and runs in a terrain cut to Hasenbuck station.

This section of the route was the most technically demanding of the entire Nuremberg subway, as both the central hall of the main station and significant historic buildings of the old town are undercut.

This spans the intersection Fürther Straße / Adolf-Braun-Straße / Sigmundstraße in full length and, like the station Stadtgrenze, has outer platforms.

The route continues in the middle position of the Fürther Straße, before crossing the Frankenschnellweg in an S-Bahn and reaching the station located on a dam city boundary.

Afterwards, the route swings to the north, runs under the Schwabacher Straße to the coal market and reaches the station Fürth Rathaus.

However, there have in the past been plans for an extension towards Fürth Kieselbühl, which are however conditioned on future infill development at that site which has been put off for the time being.

As part of that area is to be re-used for a new "Technical University of Nuremberg" there are proposals to build an infill station somewhere along this section of the line.

However, other than the new generation of trains ("G1") entering service from late 2019 onward being built with a removable driver cabin, no provision for driverless operation has been made as of 2020.

However, a modified series, designated "DT3F" was introduced on U1 a few years after the introduction of the driverless DT3, the main difference being the addition of a driver's cabin.