This shot (sorry I do not have the original photographer's name to hand) clearly shows a very short wheelbase, and very great overhang where the driver sits. Such a design cannot fail but to wiggle.

Regards,

On 04/08/2012, at 5:49 PM, Mal Rowe wrote:

>
> On 4/08/2012 4:21 PM, Greg Olson-Hyde wrote:
>>
>> That was basically my point - the bogie car gives you the ride quality and multiple unit gives you capacity and gives better headway than two cars following each other.
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>> Also, in off peak or on lightly patronised lines, you get to have the two individual cars again - flexibility!
>>
>> The downside is two extra control positions and the waste of passenger space at the coupling due to the coupling itself and the two (unused) drivers compartments.
>>
>> But isn't it worth it for the ride quality and safety?
> Hi Greg,
>
> The main driving force for the low floor cars is level platform access.
> Increase in capacity could be handled either with longer artic cars or with coupled bogie cars.
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> Low floor cars are much better when the passengers have any 'wheeled item' - be it a wheelchair, a pusher or pram or a shopping jeep.
> I prefer to ride a B, but once someone gets on with a shopping or baby pusher then the centre passageway is blocked and loading and unloading ('dwell') time becomes much longer.
>
> The C2, D1 and D2 cars both ride reasonably well (especially the C2) - being later designs than the C1.
> The problem with the D2s is that they can't seem to get the braking right on the unpowered centre trucks and they frequently have bad flats.
>
> The 'hunting' behaviour of the C1s is most noticable on the light rail because they go a bit faster there.
> They behaviour is not helped by having the wheels set so far back from the front of the tramcar.
> I've lightened up the attached pic so you can see the position of the wheels more clearly.
> http://tdu.to/3024_GisborneSt_27Dec2011.JPG
> The leading axle is just under the 'trams' part of the yarra trams logo.
>
> Mal Rowe - still riding Bs
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> <3024_GisborneSt_27Dec2011.JPG>