RE: Re: Pantographs__&&__Interior__Lighting

When I called on Yarra Trams management during my visit in August last year
I was told that the surviving Ws would eventually be converted to pantos.
Any sign of this happening? Has any overhead been strung on the Box Hill
extension yet? It would be interesting to know if it will be K&M style.

Cheers,

Brent Efford

-----Original Message-----
From: citadis [mailto:[email protected]]
Sent: Monday, 24 June 2002 9:20 p.m.
To: [email protected]
Subject: [TramsDownUnder] Re: Pantographs__&&__Interior__Lighting


--- In TramsDownUnder@y..., "malrowe" <malrowe@r...> wrote:

--- In TramsDownUnder@y..., Jim Holland <pghpcc@p...> wrote:

Faiveley pantographs (believe this is the correct term for

half-diamond

pantographs) sometimes bounce along the overhead v\for various

reasons.

Virtually unheard of here. Perhaps the overhead is more evenly

hung,

but the only time you see an arc (the most obvious outcome of a
temporary loss of contact) from the pantograph on a Melbourne car

is

when the driver fails to cut off power when crossing a section
insulator.

Mal

Sorry Mal, as an operator/driver trainer/motorman or any other
description, I beg to differ, copied here is my reply to Jim on
another (Pittspurgh) list:

For a start, the Faiveley panto is a brand name but synonymous with
the "one
arm" panto to which you refer as they were the first (or the first
successful type).

The bouncing you refer to also happens with our Austbrek type one arm
pantos, what happens mostly is, when they go under frog pans of joint
trolley pole panto operation, at speed they bounce when they hit the
frog,
momentarilly loosing contact with wire. Where the trolley has been
modified
for panto only (route 109) with new overhead, this has been
eliminated.

The panto will also bounce on slack overhead, especially in summer
when the
wire sags, this is particular noticable on simple span and hanger
fittings
(again trolley pole) and the wire is high, at speed, the panto cannot
raise
quickly enough for the sudden peak at the hanger and shoots straight
across
(we are talking a couple of inches here), where the over head has been
replaced with suspended hangers (Kuhmler and Matter type), this does
not
happen, also, on out LRT lines that were once heavy rail, the simple
over
head at the start at the St. Kilda end, does this, but a few hundred
metres
in, the catenary starts from when the line was heavy rail (similar
o/h to
North Shore) and the pan is smooth as silk.

The bottom line is, the pan is not as responsive to height
fluctuations as
the trolley pole is.

Hope this helped Jim,

Greg in Oz















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