Would Union Pacific Challengers been practical on the old NSWGR

 
  Groover Train Controller

Location: A long way from home
I was thinking of use on the main south and short north.  I can see that tunnel clearances and overhang on curves would be a problem but not insoluble.  Platform clearances too much of a problem?  Or are the NSW curves just too tight a radius for them.  The AD60 class didn't seem to offer much of an increase in mainline grunt.  Challengers started appearing in the mid 1930's so the Mechanical Branch must been aware of their capabilities.  They might have been the catalyst to open up the loading gauge on the southern line and spurred standard gauge conversion to Melbourne earlier.  Storming through Redfern on the Melbourne Limited Very Happy.

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  M636C Minister for Railways

I was thinking of use on the main south and short north.  I can see that tunnel clearances and overhang on curves would be a problem but not insoluble.  Platform clearances too much of a problem?  Or are the NSW curves just too tight a radius for them.  The AD60 class didn't seem to offer much of an increase in mainline grunt.  Challengers started appearing in the mid 1930's so the Mechanical Branch must been aware of their capabilities.  They might have been the catalyst to open up the loading gauge on the southern line and spurred standard gauge conversion to Melbourne earlier.  Storming through Redfern on the Melbourne Limited Very Happy.
Groover
Unless your actual question is: "Could a much smaller and lighter 4-6-6-4 simple articulated operate in NSW?" the answer must be "No!". The earlier. smaller 1936 "Challengers" were 10'8" wide and 16'2" high. That is about two feet higher than any NSW steam locomotive. It is 22" taller than a double deck suburban car. They weighed 566 000 lbs: 252 tons, a little lighter than an AD60 but with six fewer axles.

The Garratt was intended to provide the power of a 57 class on lighter track with a 15 ton axleload which it did. It was used on main lines because it was just as suitable for heavier track, once the load on the bogies was reduced.

Peter
  Dangersdan707 Chief Commissioner

Location: On a Thing with Internet
I was thinking of use on the main south and short north.  I can see that tunnel clearances and overhang on curves would be a problem but not insoluble.  Platform clearances too much of a problem?  Or are the NSW curves just too tight a radius for them.  The AD60 class didn't seem to offer much of an increase in mainline grunt.  Challengers started appearing in the mid 1930's so the Mechanical Branch must been aware of their capabilities.  They might have been the catalyst to open up the loading gauge on the southern line and spurred standard gauge conversion to Melbourne earlier.  Storming through Redfern on the Melbourne Limited Very Happy.
Groover
God No.
  Groover Train Controller

Location: A long way from home
I was thinking of use on the main south and short north.  I can see that tunnel clearances and overhang on curves would be a problem but not insoluble.  Platform clearances too much of a problem?  Or are the NSW curves just too tight a radius for them.  The AD60 class didn't seem to offer much of an increase in mainline grunt.  Challengers started appearing in the mid 1930's so the Mechanical Branch must been aware of their capabilities.  They might have been the catalyst to open up the loading gauge on the southern line and spurred standard gauge conversion to Melbourne earlier.  Storming through Redfern on the Melbourne Limited Very Happy.
Unless your actual question is: "Could a much smaller and lighter 4-6-6-4 simple articulated operate in NSW?" the answer must be "No!". The earlier. smaller 1936 "Challengers" were 10'8" wide and 16'2" high. That is about two feet higher than any NSW steam locomotive. It is 22" taller than a double deck suburban car. They weighed 566 000 lbs: 252 tons, a little lighter than an AD60 but with six fewer axles.

The Garratt was intended to provide the power of a 57 class on lighter track with a 15 ton axleload which it did. It was used on main lines because it was just as suitable for heavier track, once the load on the bogies was reduced.

Peter
M636C
Thank you.
  neillfarmer Train Controller

Could a 4-6-6-4 Challenger type be run in NSW? I don't think so, a true challenger embodies dimensions to make them higher speed machines than previous articulateds. The large, long boilers and consequent over hangs would be too much of a restriction so as to make that type of motive power unfeasible for NSWGR. There was a proposal in 1931 to use two 55 class running gears under a 57 class boiler to make a 2-8-8-0 but it was not proceeded with. In 1933 a similar 2-6-8-0 was also abandoned. So we could probably have had a low drivered 4-6-6-4 with a 57 class boiler but it would have been of questionable value and not a true Challenger. A better bet would have been to design a heavy mainline Garratt with 20 or 22 ton axle load and a larger boiler than the 60 class, 60" drivers etc. As it was the 60 class was a good compromise, reasonable speed, good TE and power and able to run on most lines. In retrospect the full order of 50 would not have been too many.

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