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.
Tony P
On Wednesday, 21 July 2021 at 16:02:57 UTC+10dba...@... wrote:
> What, exactly, is a Jacobs bogie?
>
> David
>
>
> 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...@...
> wrote:
>
>> 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
>> out.
>>
>> 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?
>>
>> Regards
>>
>> 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
>>> Prague.
>>>
>>> David
>>>
>>>
>>> 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.
>>>
>>>
>>> https://www.expats.cz/czech-news/article/parade-of-historical-trams-honors-130-years-on-prague-rails
>>>
>>> A fine summer's day for it:
>>>
>>>
>>> https://scontent.fsyd4-1.fna.fbcdn.net/v/t1.6435-9/217713156_4143216382434848_5688233704860129311_n.jpg?_nc_cat=109&ccb=1-3&_nc_sid=730e14&_nc_ohc=OWQJ0WiABsIAX_-jGHj&_nc_ht=scontent.fsyd4-1.fna&oh=7fd2670dda4621fe0f0b9b08ab0174ff&oe=60FA7930
>>>
>>>
>>> https://scontent.fsyd4-1.fna.fbcdn.net/v/t1.6435-9/218851538_4143216159101537_4069468143783729548_n.jpg?_nc_cat=107&_nc_rgb565=1&ccb=1-3&_nc_sid=730e14&_nc_ohc=nGyYLDEAJWIAX_pcPvH&_nc_ht=scontent.fsyd4-1.fna&oh=0f3d9330e5a0dcf801bc1bfe8fc844e1&oe=60FC0207
>>>
>>>
>>> https://scontent.fsyd4-1.fna.fbcdn.net/v/t1.6435-9/217400009_4143216069101546_4036194390772267216_n.jpg?_nc_cat=106&ccb=1-3&_nc_sid=730e14&_nc_ohc=5zZFviFZ-RQAX-8do0O&_nc_ht=scontent.fsyd4-1.fna&oh=4fa1173d5ed32a537814d5e4d0ed640a&oe=60FC0FCA
>>>
>>>
>>> https://scontent.fsyd4-1.fna.fbcdn.net/v/t1.6435-9/217663901_4143216059101547_3602521447494159218_n.jpg?_nc_cat=108&ccb=1-3&_nc_sid=730e14&_nc_ohc=WOzZ4QRrXWEAX-ZuuTs&_nc_ht=scontent.fsyd4-1.fna&oh=89d5a5b483a2aa49eb1b47a067744afe&oe=60FBDC4F
>>>
>>>
>>> https://scontent.fsyd4-1.fna.fbcdn.net/v/t1.6435-9/218228641_4143215932434893_2779728746671827262_n.jpg?_nc_cat=106&_nc_rgb565=1&ccb=1-3&_nc_sid=730e14&_nc_ohc=viMSal5O4Y4AX9Qk5m0&_nc_ht=scontent.fsyd4-1.fna&oh=77e4b0ccd67c6611889a882d30ced19b&oe=60FB759E
>>>
>>> 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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