[PRCo] Re: Trolley question

[TEP]

Fred, Leeds used bow collectors in the later years, including the ex LT 
Felthams.
Tom Parkinson
--------------------------

Schneider Fred wrote:
> To elaborate on Phil's comment, London England used to use swivel  
> shoes with wheels on their tram cars, principally because their poles  
> were not centered in the middle of the cars but off to the side and  
> the harp had to allow the wheel to swivel from side to side to enable  
> it to run tangent to the wire.   I looked on line for you tube videos  
> of London and the closest I can find is the one that Derrick posted  
> earlier today ... The Elephant Never Forgets ... reposted below.    
> Look closely and you will see the mammoth harp.
>
> http://www.youtube.com/watch?v=a7lK2tDglXQ&feature=related
>
> There is a tape of Metropolitan 331 at Crich but it was a car that  
> went from London to, I believe, Leeds and then came to the museum and  
> was repainted as a London car.   John will be sure to correct me if  
> I'm wrong.   I'm pretty sure that the pole was properly centered in  
> Leeds and it was never fully restored to its London configuration.    
> The museum at Crich was started in the early 1960s, a decade after  
> the last London cars ran and the ones they have came home from  
> somewhere else or were rebuilt from outbuildings or sheds.
>
>
>
>
> On Feb 3, 2009, at 2:42 PM, Phillip Clark Campbell wrote:
>
>   
>>> ----- Original Message ----
>>>       
>>> From: ROBERT R ROCKWELL <w3syt1 at msn.com>
>>> To: pittsburgh-railways <pittsburgh-railways at dementia.org>
>>> Sent: Tuesday, February 3, 2009 10:49:36 AM
>>> Subject: [PRCo] Trolley question
>>>
>>>       
>> Mr.Rockwell:
>>
>> My first answer to each question is for streetcars and the second  
>> one is for
>> trolleybuses but there are always exceptions aren't there.
>>
>>     
>>> Does the trolley wheel harp or slider swivel on the pole ?
>>>       
>> No for streetcars
>> Yes for TBs
>> Some streetcars retrofitted with swivel harps.
>>
>>     
>>> Does the pole swivel in the base?
>>>       
>> Pole is clamped into the base for both streetcar and bus.
>>
>>
>>     
>>> Does the spring loaded base assembly swivel on the car roof ?
>>>
>>>       
>> Yes, the base moves to allow movement of the pole.  There is a  
>> shunt attached
>> to the base so current is routed around bearings otherwise they  
>> would arc, pit, and
>> eventually freeze.  This shunt will limit how far the pole can move  
>> but it is generally
>> arranged so it can turn 180-degrees and operate from that position  
>> if necessary.
>>
>>
>> Phil
>>
>>
>>
>>
>>
>>
>>     
>
>
>
>   

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