User talk:93.231.115.158

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Happy editing! Eihel (talk) 03:05, 27 July 2023 (UTC)

July 2023

Hello, I'm Joyous!. I wanted to let you know that one or more external links you added to Eritrean Railway have been removed because they seemed to be inappropriate for an encyclopedia. If you think I made a mistake, or if you have any questions, you can leave me a message on my talk page, or take a look at our guidelines about links. Thank you. Joyous! Noise! 03:04, 27 July 2023 (UTC)

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Hello, I'm Eihel. I noticed that you added or changed content in an article, Eritrean Railway, but you didn't provide a reliable source. It's been removed and archived in the page history for now, but if you'd like to include a citation and re-add it, please do so. You can have a look at referencing for beginners. If you think I made a mistake, you can leave me a message on my talk page. Thank you. Eihel (talk) 03:12, 27 July 2023 (UTC)

Hello, both -

I am Thomas, I'd suggest we'll remain with CTW.

I am not an IT professional, to say the least.

OK, your question for references: I would propose to enter it into the list under #18:

Page 41 in: "Locomotives made in Germany", 1966/68 edition, no ISBN, Frankfurt/Main: Exportfoerderungsverband der deutschen Lokomotivindustrie (now VDB), 1966, covering Krupp "M 700 B'B'" data - may be this way.

This page 41 is rather a "spec sheet" for the four locomotives 25D through 28D, but merely depicts unit 27D, still with insignia of Ethiopia on the cabsides, in its delivery state of 1957, b/w only.

Plenty of sources of this brochure in the WWW, ebay, etc; here's one more: https://www.buchfreund.de/de/d/p/94385581/lokomotiven-made-in-germany Prices vary between 15 and 80 (!) Euros. Note it is the light blue cover, the dark one is the 1972 edition which is not helpful in this context.

I had modified the UIC designation of the axle arrangement (axle code) into B'B'-dh which indicates that the wheelsets of each bogie are connected by a fixed link, namely cardan shafts between the angular reduction gearboxes sitting on the wheelset shafts, thus preventing the wheelsets (aka "axles") to rotate independently contrasting with normal diesel-electric Bo'Bo'-locomotives. The "B'B' " designation is irrespective of whether the transmission gearbox has separate torque conversion or through coupling of the bogies. The rigid coupling of rotation and torque of both wheelsets thus makes the difference.

The A4-sized sheet covers makers designation "M 700 B'B'", powered by a medium-speed MAN "W6V 22/30A" diesel engine, which fed/feeds a Krupp "2W2 D35" hydraulic transmission gearbox, apparently to the "Lysholm-Smith" principle, possibly with a torque separation between the two bogies, particularly of an advantage on curvaceous track (as is definitely the case in Eritrea) due to an eliminated "blind torque" between bogies, but at the expense of a rather smooth/low-graded efficiency-vs-speed characteristics (info from Henschel loco works using the transmission from competitor Krupp for 950 hp BB-dh rotary snowploughs). I do not know, but (unfortunately) consider it highly unlikely that any re-engining and re-fitting of both remaining locomotives with modern and standard power plant has ever occurred. Today, replacement by far more and modern, yet robust locomotives would be more desirable.

This Krupp hydrodynamic power transmission was/is a major difference to other German diesel-hydraulics, and might have resulted in an early shortage of spares when Krupp gave up on building hydraulic "gearboxes" later in the 1960ies, competition by Voith having become too strong and the global market even stronger preferring diesels with exclusively electric transmission, as available from France, UK, Soviet Union, China, and not least the big US manufacturers.

It remains to be critically discussed if such a small series of 4 such locomotives with then-proprietary power transmission was ever considered sufficient, which in my opinion it was not, never. For this line, with a given traffic potential, 40 such units might have been merely a first step to modernise, and enabling containerization a next step. However, this was and is subject to the financial "grace" of both governments normally arranging such deals. Thus, the few 1957 Krupp locos remained the last deliveries of modern locomotives for the railway line so far, now also coming of age. It is to be bitterly regretted that two of them (26D, 28D) had been destroyed by war action. My hope is that a few spares could have been salvaged from the debris. For, if such a line once stops running, it will have ceased operation for ever. My guess is that this is neither in the interest of the country nor the people, nor the economy to be served and boosted by the rail link. IMO, a "steam museum" cannot serve that purpose.

Before getting into my link turmoils, I had offered to send you admins the copies of the mentioned spec sheet, to be used as the reference or for cross-checking. I do not know who may hold the copyrights today, as Krupp loco works do no longer exist, and had not been the publisher of the mentioned brochure. My proposal would be to enter the line drawing, and if protest arises, remove it. IMHO, There's no commercial value behind it, anyway. I have so far failed to enter anything pictorial under commons licences, etc., so shy away from directly putting up the stuff here.

Kind regards,

CTW 93.231.115.158 (talk) 14:05, 28 July 2023 (UTC)

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