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Abreviations - Prototype Information. - The Prototype. - Your Model Railway Club
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 Posted: Sat Sep 13th, 2008 04:48 pm
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georgejacksongenius
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Just wondering if anyone can help with this one.I've heard some steam engines described as 2MT or 4MT,and some as 2P or 4F.
   What does MT,P and F mean in those contexts? Anybody???
I presume its something to do with how powerful they are.:hmm

Cheers,John.B.

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 Posted: Sat Sep 13th, 2008 05:05 pm
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Dukedog
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John,
First number is the "Power" class
2, 4, 5, 8 9 etc
The higher the number the more powerful the engine.

The letters are the type of trafic the loco was designed for.

MT = Mixed Traffic  
F   = Freight
P   + Passenger

Eg;
 8F class 8 freight engine  9F class frieght etc etc.


 The GWR and later the Western region had a different classification using coloured discs above the cab side number plate.
In order of power they were..
None
Blue
Yellow
Red
Double red (Only Kings had this classifaction)

Hope this helps

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 Posted: Sat Sep 13th, 2008 05:09 pm
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georgejacksongenius
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Frank,
        You're a star!!!
Cheers,John.B.:pathead:pathead:pathead

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 Posted: Sat Sep 13th, 2008 05:22 pm
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Robert
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That information is worth putting in the Forum Index, thanks Frank.



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 Posted: Sun Sep 14th, 2008 02:17 am
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Christrerise
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Frank,

I believe that you have possibly got mixed up with the GWR power classes?  Now remember that I am not expert on anything steam related, unless it involved Cornwall when I may have some knowledge!  So if I am wrong I will of course grovel...

On Great Western built or owned locomotives there are coloured discs on the cabsides, usually with a letter within the disc and sometimes with a white X underneath.

The colour of the disc denotes the route availability of the locomotive (by axle load) and the letter within denotes the power.

  1. No coloured disc:  Unrestricted (less than 14 tons on heaviest axle)
  2. Yellow disc: 14t - 16t
  3. Blue disc: 16t - 17t 12cwt
  4. Red disc:  17t 12cwt - 20t
  5. Double Red:  22t 10cwt (The King was the only loco to carry this classification).
The letters within the discs mean the following:

  • None:  Up to 14,000lb tractive effort
  • A  14,000lb - 18,500lb
  • B  18,500lb - 20,500lb
  • C  20,500lb - 25,000lb
  • D  25,000lb - 33,000lb
  • E  33,000lb - 38,000lb
Anything over 38,000lb was a special, like the Kings at 40,300lb.

The "X"s were applied during the war and continued in use thereafter, they denote an engine that can be "overloaded". The railways have set load limits for each class of locomotive, but some locos in a class are more powerful than others, especially after cylinder boring and tyre turning. As the railways were desperate to get oversize trains on the move, they formalised what shed foremen had probably been doing for ages and put an X under the power classification of the relevant engines.

All Modified Halls carry an X because they can cope with more load than the standard Hall, although the book tractive effort is the same. 3822 has an X because tyre turning and cylinder boring put it's calculated tractive effort over 38,000lb

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 Posted: Sun Sep 14th, 2008 05:23 am
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georgejacksongenius
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Frank,Chris T,
                   many thanks for your info lads.I'll tell you something.......there's a wealth of knowledge on this forum!
Brilliant!!!

:HappyCheers,John.B.

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 Posted: Sun Sep 14th, 2008 07:32 am
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owen69
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georgejacksongenius wrote: Frank,Chris T,
                   many thanks for your info lads.I'll tell you something.......there's a wealth of knowledge on this forum!
Brilliant!!!

:HappyCheers,John.B.
you got it in one John.b thats why i never bother looking around ,its all here.
good eh ?
:cool wink:lol::lol::lol::lol::cool:

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 Posted: Sun Sep 14th, 2008 08:20 am
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Robert
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For this kind of information if you want to look it up again in the future then just go to the Forum Index because as this type of info is posted I put it straight into the Index.



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 Posted: Sun Sep 14th, 2008 03:27 pm
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Dukedog
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Chris, Yes you are correct about the GWR colour discs.
It was late last night when I typed my reply and I wasn't rally "with it" at all, I had been on Nights the evening previously and hadn't had much sleep!
Glad you pointed out the errors.

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