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South Africa class 22 2-10-4

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South Africa class 22 2-10-4
Posted by IA and eastern on Sunday, April 25, 2021 1:53 PM

South Africa built one class 21 2-10-4 and had a proposal for a class 22 2-10-4. How much bigger was this proposed locomotive? Gary

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Posted by Overmod on Sunday, April 25, 2021 3:50 PM


Wikipedia says:

A design for a Class 22 steam locomotive, Watson's final design, was submitted at about the same time. The proposed Class 22 was also to have a 2-10-4 Texas wheel arrangement, but was to have been a heavy mainline version of the Class 21 with an axle load of 22 long tons (22.4 tonnes), the heaviest that current SAR track could bear on its 96 pounds per yard (48 kilograms per metre) mainline rail. It was to have been a massive machine with larger 60 inches (1,524 millimetres) coupled wheels, a larger 80 square feet (7.4 square metres) grate and the larger Type EW tender which was later to be used with the Class 23 locomotive.[1][2][3][5]

If this engine had been built, it may have been one of the world's most outstanding locomotives. The proposed boiler pressure was 250 pounds per square inch (1,724 kilopascals), a figure never attained on the SAR, and its anticipated tractive effort of 66,406 pounds-force (295.39 kilonewtons) at 75% of boiler pressure would have made it capable of handling loads of 2,200 long tons (2,235 tonnes) on the coal run from Witbank to Johannesburg with comparative ease.[1][2][5]

The design was a compromise between a 2-8-4 passenger class with 66 inches (1,676 millimetres) coupled wheels and a 2-10-2freight locomotive with 60 inches (1,524 millimetres) coupled wheels. At the time, however, the demand for general utility locomotive types was so pronounced that no good argument could be put forward for the introduction of a heavy locomotive dedicated to goods working only. Another factor which acted against the project was the insufficient length of the receiving sidings in the yards which made it doubtful that such a locomotive would have been able to be used to its full capacity.[2][5] 

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Posted by Sara T on Sunday, April 25, 2021 3:58 PM

>>South Africa built one class 21 2-10-4 and had a proposal for a class 22 2-10-4. How much bigger was this proposed locomotive? Gary<<

 

Juniatha could have commented on that -

but she doesn't write here anymore.

Tant pis!  Tongue Tied

Sara

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Posted by BaltACD on Sunday, April 25, 2021 4:24 PM

Sara T
Juniatha could have commented on that -

but she doesn't write here anymore.

Tant pis!  Tongue Tied

Sara

Her problem.

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Posted by BEAUSABRE on Sunday, April 25, 2021 6:01 PM

Juniata....What does the PRR have to do....OH, it's a Texas type like a J1 ! Of course

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Posted by CSSHEGEWISCH on Monday, April 26, 2021 10:06 AM

The proposal is not too surprising.  SAR designed and operated some locomotives for Cape gauge that would have been outstanding on standard gauge.

The daily commute is part of everyday life but I get two rides a day out of it. Paul
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Posted by Flintlock76 on Monday, April 26, 2021 11:02 AM

No, when a fount of knowledge is lost to us it's our problem.  Maybe not a big problem as far as problems go, but it's a loss just the same.

This Forum's getting boring, if it wasn't for young Mr. Harrison and his infectious enthusiasm I'm not sure I'd even look in anymore. 

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Posted by SD70Dude on Monday, April 26, 2021 2:35 PM

Flintlock76

No, when a fount of knowledge is lost to us it's our problem.  Maybe not a big problem as far as problems go, but it's a loss just the same.

No one is stopping her from returning, unless the mods banned her account (which I doubt).  

I enjoyed reading her posts and will continue to enjoy reading old ones whenever research turns up an old thread she contributed to.  

I was not able to log in for the last day or two, perhaps a few more people have been faced with the same problem once again.

Greetings from Alberta

-an Articulate Malcontent

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Posted by kgbw49 on Monday, April 26, 2021 3:38 PM

I think it is pretty phenomenal that this Cape Gauge SAR Class 22 2-10-4 would have had more tractive effort than the Standard Guage NSW AD60 Class 4-8-4+4-8-4 Garratt.

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Posted by Flintlock76 on Monday, April 26, 2021 5:28 PM

SD70Dude
No one is stopping her from returning, unless the mods banned her account (which I doubt).  

I think they did. 

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Posted by SD70Dude on Monday, April 26, 2021 5:32 PM

Flintlock76
SD70Dude
No one is stopping her from returning, unless the mods banned her account (which I doubt).  

I think they did. 

Rats

Greetings from Alberta

-an Articulate Malcontent

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Posted by Sara T on Monday, April 26, 2021 7:03 PM

Beausabre

this is a confused posting, first you misspelled "the name" (I don't know which one you mean since everybody has been so keen on pointing out that with "th" and with only "t" these are two completely-totally-absolutely-non-having-nothing-to-do-with-each-other names), second >>What does the PRR have to do<< Yes, what? Do you suggest she can't tell a little Cape gauge loco from a "real" one? It would be interesting to learn what your (long and winding) ways of thought have been on that posting. Although it might get mind blowing.

Smile

Sara

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Posted by Flintlock76 on Monday, April 26, 2021 8:24 PM

BEAUSABRE

Juniata....What does the PRR have to do....OH, it's a Texas type like a J1 ! Of course

 

Actually, who Sara T's talking about is Juniatha, our resident Queen of Steam.

Not the PRR's Juniata Shops.  But I can see where the confusion comes in. 

But that South African locomotive would  be a "Texas" type, even though it would have been as far from Texas as you could get!  

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Posted by rixflix on Monday, April 26, 2021 9:38 PM

Sara T
(long and winding) ways of thought

Beausabre evidently missed the April forum drama and thought Juniatha was a misspelling of Juniata.

Aaaah, long and winding trains of thought...mental PSR?

Rick

rixflix aka Captain Video. Blessed be Jean Shepherd and all His works!!! Hooray for 1939, the all time movie year!!! I took that ride on the Reading but my Baby caught the Katy and left me a mule to ride.

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Posted by Flintlock76 on Tuesday, April 27, 2021 8:41 AM

rixflix
Aaaah, long and winding trains of thought...mental PSR?

I gave up on mental PSR a long time ago, I've only got just so much room in the "Brain Housing Group."  For something to go in, something has to go out!  Confused

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