Recently I admitted to being no fan of diesels - I now am hoping to get a
little more edumuckated about them and am hoping some kind soul could
explain the CO CO and BO BO terminology when referring to same.
I can just see some chaps giggling behind their hands at my ignorance! But
no matter - if I dunno sumpin' I akss.
many thanks
Steve
CO: 3-axle bogie/truck with all axles powered
BO: ditto for 2-axle bogie
A-1-A: 3-axle bogie with the 2 outer axles powered
1-CO: bogie with 3 powered axles and an unpowered pony axle
CO-BO: loco with one 3-axle bogie and one 2-axle bogie.
MartinS said the following on 07/06/2006 22:09:
Just to expand on that a bit further, the "o" means that each axle is
individually powered, so a class 47 with each axle driven by a separate
motor is a Co-Co, whereas a Western, with the same number of wheels
driven, is a C-C because the axles are linked together within each bogie.
It's an alphamumeric code for how the wheels are laid out, and it'll
work for anything, not just diesels: an example would be a Gresley
A4 or Stanier Duchess, either of which would be a 2C1. A Riddles 9F
would be a 1E.
Carrying axles get numbers: 1 carrying axle gets a 1, 2 get a 2
and so on. Driving axles get letters. One driving axle is A, two
together B. three C. If they have individual drives (electric motors,
individual single-action steam engines, hamsters in cages..) they get an
o suffix, e.g. Bo
If two groups of drivers (each in a single frame, such as a bogie)
have a direct coupling between the bogie frames (ie. not through the
bodyshell or underframe then there's a "-" between the groups. There's
also a "+" linker, but I can't remember off-hand what it represents.
So...
A Stirling 8' single would be 2A1
A Midland 4F would be C (like an 08 diesel shunter)
An LM&S Beyer-Garrett would be 1C C1 (and a Peak-type diesel 1Do Do1
And the MR Paget locomotive (with steam motors on all axles) would
be 1Co1 :)
Of course it is. It's been a long hot day.
On reflection, "+" denotes a separate driving group in an entirely
separate frame, linked through a coupling? So a steam example
might be that mobile parade of steam machinery. Harrison's
'Hurricane' on the GW in the early days: 1A1+3, while a more
modern and electric example could be the Swedish Dm3s:
1D+D+D1
And we don't bother with the small "o" on this side of the pond as every
single loco has one motor per powered axle, with no linked drives. Thus,
it's C-C, B-B, D-D, A1A-A1A.
--
Cheers
Roger T.
Home of the Great Eastern Railway
Most Americans get it wrong - they call any 6-wheeled truck a C.
Whether they're A-1-A (the streamlined E-units) a genuine C (the
Krauss Maffei diseasel hydraulics) or a Co.
The Krauss Maffei diesel hydraulics had a single drive to each truck,
with each axle powered. As do some preserved EMD and Whitcombe
switchers with side rods on the trucks.
No, you've got it wrong. North Americans (Canadians, Americans, Mexican,
Cubans et al) don't do what you wrote.
--
Cheers
Roger T.
Home of the Great Eastern Railway
As each axle was powered, they become a C-C (?). I can't recall if they
were two or three axle trucks.
I don't recall how they were described. My "Diesel Spotters Guide" is not
to hand.
Thanks for ALLLLLLLLLLLLLLLLLLLLLLLLLLLLL the replies
:)))
I am no longer confused, though have to admit that if I was forced to recite
all the designations at this time I would probably just throw myself into
the 4-6-2
"mindesign" wrote in
news:jpLig.3106$ snipped-for-privacy@nasal.pacific.net.au:
LOL!
Bloody colonials, what's wrong with the good old 4-4-2?
Mind you the 2-6-4 is nice at this time of the year but looking further
afield the 4-6-4 may still be a little cold.
No, you've got it wrong. North Americans (Canadians, Americans, Mexican,
However, as this is UK.rec etc , I suspect most of us don't really care
about Americans.
nothing wrong with a 4-42 at all mate ..... I love them too
They're just not called Pacific's so I am at a loss as to how I could
squeeze a joke out of using them in this thread
:))))))
Steve
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