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G'day Master,
A Bo-Bo will get up and go a tad quicker than a Co-Co, and be able to provide higher speed depending upon wheel diameter and gearing.
Naturally two less traction motors sharing the voltage etc.
Hence many pas weasels or buzz boxes were / are Bo-Bos.
But, to slog it out on steep grades with heavier loads, the Co-Co has more ability.
Naturally all units can wheel-slip, but a high wheeler Bo-Bo will suffer more wheel slip potential than a smaller wheel diameter Co-Co.
8650 being a Tri-Bo did not manage to lift heavy loads with any more agility to the standard Co-Cos.
But, it was supposed to cause less flange and rail head wear.
Additional loco weight was not possible due to our rail axle weight ratios.
I guess similar to the Beyer Garratt soot belcher concept which did NOT provide double the oomph of the normal pair of equivalents.
It was sad that one aspect of 8650 was not further envisaged.
It had the ability to be converted to 25 kVA.
Our woeful 1500 vDC system just could not hack the additional oomph necessary for quad multiple buzz box loads.
Steve.
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