Mal would be able to answer that one giving his favourite tram as an
example! It's a bogie shared between two cars. A. example is the centre
bogie on the B class tram. The Skoda bogie is a little different, having
two kingpins, each one attached to each car in order that the tram can
negotiate tight curves (15-18 metres) and still remain within its kinematic
envelope. A normal Jacobs bogie has one kingpin attached to the coupling
point between two cars.
On Wednesday, 21 July 2021 at 16:02:57 UTC+10dba...@... wrote:
> What, exactly, is a Jacobs bogie?
> On 21 Jul 2021, at 12:15 am, TP histor...@...> wrote:
> The Skoda 15T isn't a derivative of the 14T, it's a completely different
> design. The 14T belongs to the same family of fixed-truck trams as the
> Citadis etc (though runs better than the Citadis). The 15T is a patent
> design of its own and has no direct derivatives as no-one is using Jacobs
> bogies nowadays and Skoda has patented the best Jacobs bogie design for a
> low-floor tram. So the third stream of design platform in current low-floor
> trams - for operators wanting proper swivelling bogie trams - is that
> represented by the E class. This has the disadvantage of the bogies being
> within the cabins, hence constraining internal layout and door
> configuration options, but it's quite a popular design nowadays as trams
> are conceived more as standee vehicles and not so much attention is given
> to the niceties of seating. Within this design group, however, there are
> sometimes different bogie layouts for individual clients, including a
> mixture of fixed and swivelling bogies.
> So that's the state of the art at present with no major technology shifts
> (other than the wireless or autonomous tram) on the horizon. That early era
> of experimentation with low-floor engineering, of which the Cobra and
> Eurotram were examples, is over.
> Tony P
> On Tuesday, 20 July 2021 at 22:09:56 UTC+10transit...@...
>> Mention of the Zurich Cobra Trams led me to browsing the Eurotram. and
>> thence the Bombardier family of trams, with the woeful story of Bombardier
>> trams in Ontario. This again led to the Skoda 15T and its derivatives - or
>> perhaps I should say the derivatives of the 14T with their problems ironed
>> This led me to wonder, has there been any real advance in tram design
>> (other than technology) since the Eurotram and the Skoda 15T. How does the
>> Melbourne E class stack up against these?
>> Dudley Horscroft
>> On 20/07/2021 9:02 pm, TP wrote:
>> Do you think so David? Like most older trams, I would describe the
>> Ringhoffers most kindly as "quaint". My favourites are the American PCC
>> and their derivative, the Tatra T3, and the Sydney R/R1, all first-rate
>> examples of early modernity with high aesthetic quality. However, it's
>> important to preserve representative examples of various types of vehicle
>> throughout history and I admire any example of a fine restoration, whatever
>> the vehicle. The low-floor era has brought more consistent aesthetics,
>> though it's all reached a level of sameness where only the nose cone
>> distinguishes them and there are certainly some ugly doozies among those.
>> The Adtranz Cobra is my favourite example of good aesthetics in a low-floor
>> tram. The fact that they didn't work so well is another subject, something
>> that can't be said of the PCCs, the Tatra T3 and the R/R1!
>> Tony P
>> On Tuesday, 20 July 2021 at 15:40:40 UTC+10dba...@... wrote:
>>> Thanks, Tony. Much nicer looking than the more modern ones I saw in
>>> On 20 Jul 2021, at 2:28 pm, TP histor...@...> wrote:
>>> Any excuse for a good tram parade. Leading the parade is no. 18 from
>>> Pilsen, the oldest operating electric tram in Central Europe.
>>> A fine summer's day for it:
>>> The photos at the multi-platform loop are at Prague's equivalent of the
>>> Randwick Racecourse station, at Strahov Stadium.
>>> Tony P
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