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[email protected] · February 23rd 17, 02:27 PM posted to uk.transport.london

In article ,
(Mark) wrote:

On Wednesday, 22 February 2017 11:12:21 UTC, Neil Williams wrote:
On 2017-02-22 09:48:49 +0000, d said:

Wires look like crap. What's wrong with hydrogen buses?

Supply and storage. Though there is one hydrogen bus route in london
that runs through southwark. Can't remember the number.

RV1, which has always been rather a test bed for TfL.

Wires don't necessarily "look like crap", in any case. Decorative
poles can be used to enhance the look.

There was an RV1 broken down on the Aldwych this morning, completely
blocking half of the road.

Central London is constantly dug up and rebuilt with many bus route
diversions. A trolleybus wouldn't be able to divert along an unwired road.

They're also a nuisance when the pickup arm gets disconnected from
the wires.

Traction batteries would cope diversions. My experience of dewirements was
that the booms were restored pretty quickly, especially given that London
trolleybuses never had trolley ropes.

--
Colin Rosenstiel

[email protected] · February 23rd 17, 07:06 PM posted to uk.transport.london

In article ,
() wrote:

On Thu, 23 Feb 2017 13:31:55 +0000, Neil Williams
wrote:

On 2017-02-23 12:11:31 +0000, Mark said:

Central London is constantly dug up and rebuilt with many bus route
diversions. A trolleybus wouldn't be able to divert along an unwired
road.

Many of them have a small generator or battery for precisely that
purpose.

Wasn't there one London garage that depended on the buses reaching a
wired street by using their battery along an unwired one?

First of all, London trolleybuses didn't use garages. They used depots. They
were treated as rail less trams rather than buses. I'm sure no depots lacked
wired access but I have a feeling

They're also a nuisance when the pickup arm gets disconnected from the
wires.

It's not hard to put it back on using the ropes at the back.

It is quite possible now to have automated systems that can position
the Trolleys onto the wires without a member of crew having to pull on
a rope or use a long insulated pole . That's provided that the
trolleys or the overhead hasn't been damaged due to the dewirement.
It would almost be a requirement now,when London had Trolleybuses last
time around they had conductors who could extract the bamboo pole from
underneath and rewire them. Even then they had problems with traffic
understandably pulling up close to the rear of the bus that did not
allow enough room for the bamboo to be withdrawn .Some systems carried
the pole on the side because of this.
In todays busy traffic having a driver leave his seat to wield a long
pole around or haul on a rope would soon have some impatient passenger
moaning like hell on twitter because he is late or a another road user
would get road rage and lump the driver one.

Which trolleybus systems have automated systems which restore booms after
dewirements? I've never heard of that and can't imagine how it might work
thinking of dewirements I observed in London and later in Brazil.

My recollections of the London system was that insulated poles were hung on
traction standards all over the network for use where dewirements (and
planned removals at lay-by points) were regular. They were much more often
used than those under the trolleybuses (I remember the holder tubes being
empty as often as not).

Ropes as used by trolley retrievers were very rare on British systems
, swinging ropes get easily caught on the top rear corners of a double
decker a problem that did affect the single deckers abroad who use the
rope system as std.

That would only be an issue if the booms were too short or positioned too
far forward on the roof.

--
Colin Rosenstiel

[email protected] · February 23rd 17, 08:27 PM posted to uk.transport.london

On Thu, 23 Feb 2017 13:06:42 -0600
wrote:
Which trolleybus systems have automated systems which restore booms after
dewirements? I've never heard of that and can't imagine how it might work
thinking of dewirements I observed in London and later in Brazil.

Given the state of image recognition software these days I image having a
camera that can spot the wires and then align the booms up with them would be
entirely possible.

--
Spud

Basil Jet[_4_] · February 23rd 17, 09:08 PM posted to uk.transport.london

On 2017\02\23 20:27, d wrote:
On Thu, 23 Feb 2017 13:06:42 -0600
wrote:
Which trolleybus systems have automated systems which restore booms after
dewirements? I've never heard of that and can't imagine how it might work
thinking of dewirements I observed in London and later in Brazil.

Given the state of image recognition software these days I image having a
camera that can spot the wires and then align the booms up with them would be
entirely possible.

Or just keep trying blind until the power comes back on. It wouldn't
take so long or be needed so often to be worth putting in extra
intelligence.

Does any city put Regent-Street-style Christmas decorations over
tram/trolley wires?

Clank · February 23rd 17, 09:29 PM posted to uk.transport.london

On 23.02.2017 11:08 PM, Basil Jet wrote:
On 2017\02\23 20:27, d wrote:
On Thu, 23 Feb 2017 13:06:42 -0600
wrote:
Which trolleybus systems have automated systems which restore booms after
dewirements? I've never heard of that and can't imagine how it might work
thinking of dewirements I observed in London and later in Brazil.

Given the state of image recognition software these days I image having a
camera that can spot the wires and then align the booms up with them would be
entirely possible.

Or just keep trying blind until the power comes back on. It wouldn't
take so long or be needed so often to be worth putting in extra
intelligence.

Does any city put Regent-Street-style Christmas decorations over
tram/trolley wires?

Pretty sure that's a yes. Here in Buc the adage 'less is more' is never
applied to Christmas lights, and they're strung over more or less every
major street (they make Regent Street look like a set of Argos LED tree
lights) - and we have both trams and trolleybuses. L'viv also has both
trams and trolleybuses and has lights strung across the streets at
Christmas, if I recall correctly. Moscow goes for lights in a big way
(albeit more in honour of New Year than Christmas,) although in my
observations mostly around pedestrianised streets and squares rather than
across the road as such.

Next year I'll take a closer look and report back )))

Bob · February 24th 17, 05:18 PM posted to uk.transport.london

Basil Jet wrote:
On 2017\02\23 20:27, d wrote:
On Thu, 23 Feb 2017 13:06:42 -0600
wrote:
Which trolleybus systems have automated systems which restore booms after
dewirements? I've never heard of that and can't imagine how it might work
thinking of dewirements I observed in London and later in Brazil.

Given the state of image recognition software these days I image having a
camera that can spot the wires and then align the booms up with them would be
entirely possible.

Or just keep trying blind until the power comes back on. It wouldn't
take so long or be needed so often to be worth putting in extra
intelligence.

Does any city put Regent-Street-style Christmas decorations over
tram/trolley wires?

Perhaps not as elaborate as Regent St, suspended Christmas lights above
Bahnhofstrasse are a feature of the ZÃ¼rich decorations, and Bahnhofstrasse
has pretty intensive tram service along its length.

https://newinzurich.com/2014/12/chri...-hours-zurich/

Robin

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