[PRCo] Re: Trolley__Pole__Tension

[Holland Electric Rwy. Op. H.E.R.O. -- Import SPTC 1.48 Models // James B. Holland]

North Shore hung a brake shoe from the trolley shoe  --

             No  Shprings!!!.......

                         Honest Veights!!!!!!!


When we were testing the ETI Trolleycoaches here in SF, they Did Use 
Shprings!!       A rope of the correct length was attached to trolley 
shoe with a loop several feet from the ground to engage the spring 
weight measure!

Remember PRCo Motormen as being Very Knowledgeable about proper spring 
tension on the trolley poles  --  today most managers ain't got the 
foggiest idea as to what that is.       Amazing how many times people 
search for cause of repeated dewirements but never check the spring 
tension.       Improper spring tension is  THE  reason for  99_44/100%  
of dewirements  --  anything else is just contributory.




Fred Schneider wrote:
.

>Very interesting.     Did they have a standard weight that was used?       Or were you expected to create your own concrete block on a string?
>
>James B. Holland wrote:
>
>  
>
>>Ohio Brass recommended the following at 18-foot trolley wire height::
>>
>>...................25-30 pounds pressure for  SHOE
>>
>>...................30-32 pounds pressure for  WHEEL.
>>
>>PRCo apparently adapted this for City Vs Interurban equipment.
>>
>>
>>
>>Jim__Holland
>>
>>
>>I__Like__Ike.......And__PCCs!!
>>
>>down with pantographs ---- UP___WITH___TROLLEYPOLES!!!!!!!
>>