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Old July 4th, 2009, 03:33 PM   #281
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Low floor Stadtbahn at Weiden-West, in the background you can see the S-Bahn on an embankment:


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Old July 4th, 2009, 06:10 PM   #282
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Rebuilding the Stadtbahn station Zoo/Flora:




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Old July 5th, 2009, 03:46 PM   #283
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Cologne's Hohenzollernbrücke (Hohenzollern bridge) in the fog. On the bridge is a S-Bahn train.
In the background the silhouette of the cathedral can be seen:

[IMG]http://www.**************/bilder/koeln-hbf-57596.jpg[/IMG]
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Old July 5th, 2009, 05:13 PM   #284
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Thanks for sharing! Actually how often a train passes that bridge? I guess there must be every 2 Minutes a train.
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Old July 5th, 2009, 06:59 PM   #285
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Quote:
Originally Posted by Isek View Post
Thanks for sharing! Actually how often a train passes that bridge? I guess there must be every 2 Minutes a train.
They say it's one of the railway bridges with the most traffic worldwide.
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Old July 5th, 2009, 09:56 PM   #286
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Part 1:

Quote:
Originally Posted by JoKo65 View Post
I have posted so many photos about Stadtbahnwagen B till now, so some information about it will follow here.

To understand the history of Stadtbahwagen B, the working horse of Cologne's Stadtbahn, I have to tell you something about the history of Cologne's Stadtbahn.
At the beginning of the 60ies the government of Cologne decided to build tunnel stretches, but at this time it hadn't been possible to get subsidies from the country of North Rhine-Westphalia or the German Federation. So the parameters of the tunnels had to be very moneysavingly. That means the curves had to be built with narrow radiuses for example.
That's the prehistory.

Later in the 60ies the government of North Rhine-Westphalia (NRW) decided to back the cities in building Stadtbahn networks and the German Federation did so too.
NRW created three Stadtbahn areas in which the local transport authorities should work together:

Stadtbahn Rhein-Ruhr (the Ruhr area and Düsseldorf)
Stadtbahn Bielefeld
Stadtbahn Rhein-Sieg (Bonn and Cologne)

NRW created requirements for the parameters of these Stadtbahn networks. The parameters were and are well-spaced. They decided to build a new Stadtbahn wagon for these parameters and called it type A. This Stadtbahnwagen A was supposed to have a space between the pivots of 12 m. Too much for the narrow curves of Cologne's city tunnel. Another problem: Stadtbahnwagen A was supposed to have power supply by life rail and not by catenary, but the city tunnel has been built for catenary usage.
So it was obvious that Stadtbahnwagen A was unsuitable for usage in Cologne.
Therefore Cologne and Bonn decided to develop an own Stadtbahn carriage, they called it Stadtbahnwagen "Kölner Bauart" or Stadtbahnwagen B.
The parameters:
Catenary usage, 100 km/h Vmax, to serve different platform heights, the ability to use tram stretches, space between pivots of 10 m and the ability to be rebuilt for life rail usage if needed.
Paragon has been the F74 carriage of Berlin's U-Bahn.

At the beginning of the 70ies three prototypes had been ready, one for Bonn and two for Cologne. The following tests had been so prosperous that the cities in the Rhine-Ruhr agglomeration decided to buy this carriage too, because of it's flexibility. Therefore the Stadtbahnwagen A was dead and has never been built.

The first cities in the Rhine-Ruhr agglomeration which operated Stadtbahnwagen B have been Essen and Mülheim, they received their first wagons shortly after Bonn and Cologne received theirs.

To be continued.


Part 2:

The Stadtbahn carriages type B which have been delivered in the 70ies were Stadtbahnwagen B100S. What does that mean?
100 means 100 km/h Vmax and the S means "Schaltwerksteuerung", in English: Switchgear control. This means the velocity and traction of the train are regulated by switching resistors. The driver chooses a traction programme and a servo motor switches the resistors according to that programme.

Later at the beginning of the 80ies two new techniques have been launched. Duisburg bought B80C carriages. B for Stadtbahnwagen B and 80 for 80 km/h Vmax – in the area of Stadtbahn Rhein-Ruhr they realised that the distances between the stations are too short to reach 100 km/h in most cases. The C stands for the mixed English/German word "Chopper-Steuerung" ("Gleichstromstellersteuerung" in German and chopper control in English).
The chopper is an apparatus which chops up the DC. The chopped DC can be modulated so that no resistors are needed. Without switching resistors the process of acceleration is jerkfree and the train can be steered more precise. On the other hand maintenance is much cheaper.

But another technique has been launched at the beginning of the 80ies. Düsseldorf bought B80D trains. What means the D? The D is the abbreviation for the German word "Drehstromantrieb" which means AC three-phase drive.
Because AC isn't constant, the current hasn't to be chopped up. Every AC phase has it's frequency, so the AC can be modulated by a frequency modulator. The AC three-phase drive also doesn't need resistors and therefore works jerkfree and precise too. It has a big advantage: It's maintenance costs are lower than the costs of the chopper control because AC motors are tougher than DC ones.

B80C have been delivered to: Duisburg and Dortmund.
B80D have been delivered to Düsseldorf, Bochum/Gelsenkirchen and Cologne – at the end of the 80ies Cologne began to buy trains with 80 km/h Vmax too because they had enough 100 km/h Vmax trains.

At the beginning of the 90ies Bonn bought B100C carriages. Chopper controlled carriages with 100 km/h Vmax. Some publications call them B100T, T stands for „Thyristorsteuerung“ (thyristor control), a thyristor is a component of a chopper. So B100C and B100T are the same. But the official designation is B100C.

To be continued.
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Last edited by JoKo65; July 6th, 2009 at 02:36 AM.
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Old July 6th, 2009, 11:15 AM   #287
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Quote:
Originally Posted by Isek View Post
Thanks for sharing! Actually how often a train passes that bridge? I guess there must be every 2 Minutes a train.
Here is something for you: http://www.stadtpanoramen.de/koeln/koeln_nacht.html
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Old July 7th, 2009, 10:53 AM   #288
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Interesting photo at Bf. Köln-Mülheim:


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Old July 8th, 2009, 03:11 AM   #289
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Low floor Stadtbahn, Bf. Deutz/Messe, in the middle – turning tracks:


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Old July 8th, 2009, 12:17 PM   #290
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Lohsestraße – low floor network, typical station from the beginning of the 70ies:


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Old July 9th, 2009, 12:15 AM   #291
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High floor Stadtbahn – Niehl, Sebastianstraße:



Dellbrück, Hauptstraße:


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Old July 9th, 2009, 11:17 AM   #292
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Mülheim Bahnhof:


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Old July 9th, 2009, 10:57 PM   #293
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Low floor Stadtbahn at storage sidings Zündorf:


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Old July 10th, 2009, 11:38 AM   #294
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Some city buses in the centre of Cologne at Neumarkt:






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Old July 10th, 2009, 01:25 PM   #295
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Rudolfplatz:



Andreaskloster:


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Old July 10th, 2009, 10:45 PM   #296
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Meschenich:



Herler Straße:


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Old July 11th, 2009, 02:01 PM   #297
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Regional bus at Cologne's central bus station (ZOB):



Gummersbach Hindenburgstraße:


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Old July 11th, 2009, 07:20 PM   #298
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More regional buses, Hürth, Stadtbücherei:



Bonn-Duisdorf (Bonn is served by Cologne's regional buses too):


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Old July 12th, 2009, 06:24 PM   #299
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City bus at Dellbrück Hauptstraße, crossing the Stadtbahn:



City bus at Bf. Mülheim:



Left – city bus of KVB, right – regional bus of RVK, Meschenich, Frankenstraße:


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Old July 12th, 2009, 11:11 PM   #300
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City bus at the Dom (Cologne Cathedral):


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