Re: wheel types


"BH Williams" <bhwilliams@xxxxxxxxxxx> wrote in message
news:dk26je$5s9$1$8302bc10@xxxxxxxxxxxxxxxxxxx

> Not that uncommon, though, as over 11000 HAA and derivatives were built.
> Another variation is that used on some SNCF container wagons passed for
160
> kph running- they have tread brakes on both wheels of both axles (used at
> low speeds and for parking) as well as axle-mounted disc brakes. I believe
> our (Eurotunnel) second-generation freight shuttle wagons use a similar
> system- I must have a look when I get a chance.
> Brian
>
>

Tread brakes are more efficient than disc brakes at *slower* speeds.

Slightly OT, but 156 DMU's have tread brakes and 158's have disc brakes.
Tread brakes are better in leaf-fall season because they clean the leaf
mulch off the wheel treads. A temporary fix a few years back was to create
156/158 hybrid pairs to try and minimise the problems with leaves on the
line!


Cheers,
Mick
(Waiting for the DRS 37's to pass on the water cannon...............)


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