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.
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.
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:
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.
Home of the Great Eastern Railway
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
"mindesign" wrote in
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.