[PRCo] Re: Double--Point__RR__Turnouts-__-1940--1950

[Jim Holland]

R-E----S-E-N-D    ----    AGAIN!!!!!!!
-------- Original Message --------
Subject: 	Re: Double--Point__RR__Turnouts-__-1940--1950
Date: 	Wed, 13 Dec 2006 03:59:10 -0800
From: 	Jim Holland <prcopcc at p-r-co.com>
To: 	- 1714 PRCo__WP__JTC - 
<pittsburgh-railways%dementia.org at alycia.dementia.org>, - 1717 
PRCo__WP__JTC - <pittsburgh-railways at dementia.org>
References: 	<20061212.174608.9049.1673194 at webmail01.lax.untd.com>



Hi Mark!


The  URLs  for the double point RR style turnout are still at the bottom 
of this email  --  ALL  rails, including the points, are rail height and 
slide across the top of the ties on tie plates  --  Both points move in 
tandem.
.
The  NEW  URL  below is an old one provided by Ed of construction of the 
Drake loop.       The point is several inches high and contained within 
a casting  --  the point moves to set the straight or diverge move and 
the point in this photo is on our left.       The Mate is an open ended 
casting with fill in the flangeway so that the wheel will ride through 
on its flange in part, especially when taking the diverge move and the 
wheel must pass over the straight flangeway gap.       How the wheel 
makes it through the mate is determined by the point on the other side.

With double points the wheels on both sides of each axle do not have a 
gap to pass over.

Jim___Holland



Mark McGuire wrote:
.

> I'd really like for someone to explain the difference between double 
> point and point-mate so a novice as myself can understand. Perhaps a 
> photo of point-mate alongside a double point. Thanks! Very nice photo 
> of Tylerdale Jim! When was it taken?
>
> -- Jim Holland <prcopcc at p-r-co.com> wrote:
> RE--SEND!!!!!!!
> -------- Original Message --------
> Subject: Re: Double--Point__RR__Turnouts-__-1940--1950
> Date: Tue, 12 Dec 2006 13:43:55 -0800
> From: Jim Holland <prcopcc at p-r-co.com>
> To: - 1714 PRCo__WP__JTC -
> <pittsburgh-railways%dementia.org at alycia.dementia.org>
>
>
>
> RE--SEND!!!!!!!
>
> -------- Original Message --------
> Subject: Re: Double--Point__RR__Turnouts-__-1940--1950
> Date: Tue, 12 Dec 2006 03:28:42 -0800
> From: Jim Holland <prcopcc at p-r-co.com>
> To: - 1714 PRCo__WP__JTC -
> <pittsburgh-railways%dementia.org at alycia.dementia.org>
> References: <DDEFKPCBMPHGBMKPEPNBEELJDPAA.trams2 at comcast.net>
>
>
>
>> -----Original Message-----
>> From: Jim Holland
>>
>>
>> This is a Trivia Question Only for those who Are Interested:
>> .
>> Where did PRCo use::
>> .
>> ..........Double--Point__RR__Turnouts-__-1940--1950??
>> .
>> A photo of one is enclosed.
>> .
>> .
>> .
>> JJ
>
>
>
>
> > Edward H. Lybarger wrote:
> > This could be the barn lead at Tylerdale, for example. (That's still 
> in service at PTM's Arden Loop.)
> .
> .
> Actually, it is the closest turnout in the photo below!!!
> .
> .
> hrbran99 at adelphia.net wrote:
> .
>
>> I can remember one on the Overbrook single track at one of the  
>> sidings...... I would always ask older operators if they knew when 
>> and why this type of switch was installed. None of them could ever 
>> give a reason for the railroad type switch and none of them could 
>> recall when it was installed.
>> -- 
>> HrB
>
>
> .
> .
> A-L-L the Overbrook siding turnouts were the RR dual point type. Only 
> two_(02) sidings existed on Overbrook until 1953, those 2 being Bon 
> Air curved siding and Smith/Reflectorville.     McKinley Park Siding 
> immediately south of the McKinley Park trestle and Edgebrook between 
> Bon Air and Reflectorville were added in 1953, A-L-L turnouts on these 
> new sidings were also RR dual point.
> .
> Sometime late in the Overbrook saga ({[pat]}) did replace one or more 
> of these RR points with the point and mate commonly used in streets.
> .
> .
> Bob Dietrich wrote:
> .
>
>> If I'm not mistaken Professor Holland you once pointed out to methat 
>> the turnouts just south of the Tunnel branching to Knoxville were 
>> double point.
>
>
> .
> .
> Yes, this is very true. The outbound (southbound) one was converted to 
> point and mate probably when the tower operation of turnouts was 
> discontinued. It is a longer turnout and makes for a little difficulty 
> in using the point and mate but this type of point is less prone to 
> problems when electrified -- see below. The inbound one remained RR 
> style til the end.
> .
> .
> Fred Schneider wrote:
> .
>
>> It seems to me that most of the T-rail turnouts, except for a few 
>> instances where they reverted to single point castings, were double 
>> point. That includes any crossovers on routes 10-15, 62, 56, 
>> Washington, Charleroi, 42, 38-A,
>
>
> .
> .
> This seems to be a good general statement. One major exception was 
> Washington Junction where both inbound and outbound were point and mate.
> .
> Where turnouts need to be electrified the point of point/mate would 
> have much less chance of clogging, especially in the winter. The 
> typical RR points had a much wider throw and garbage, snow, slush, 
> ice, etc. could jam the points. The motor used to power typical 
> mainline RR switches might draw significantly more amperage and be far 
> more problematic on TrolleyCar systems thus making the simple 
> point/mate much more efficient to use.
> .
> Here are some that I know of (and some I am unsure of in parenthesis) 
> but it would seem there were many more of them than one would realize 
> at first blush:::::::
> .
> .
> .
> 10/15 X-Overs West View Park
> .
> (23 Neville Island Sidings?)
> .
> (28 prw sidings?)
> .
> (29 Thornburg Siding?)
> .
> 32 X-Over Smithfield Bridge
> .
> MANY SouthEast South Hills Yard
> .
> Overbrook Sidings -- 10 turnouts, 2 at each siding and one on either end 
> to enter/exit the single track.
> .
> Some Castle Shannon Yard
> .
> Many/Most Charleroi and Washington Interurban Sidings
> .
> (Siding prw near Washington Park Jefferson/Maiden line?)
> .
> Tylerdale Car House and X-Over (photo enclosed)
> .
> W.Library loop enter and exit.
> .
> Northbound entry to South Hills Tunnel
> .
> 38A siding
> .
> 39 entry to single track OB exit single track IB
> .
> (40 single track near SHJ?)
> .
> 42 entry single track OB 42 to 38 - leave single track IB 38 to 42.
> .
> 44/48 outbound connection to Admin back track SHJ
> .
> 44/48 Loop Under prw near Warrington
> .
> 62 Trafford Sidings
> .
> 65 X-Over near Muldowney
> .
> (68 Kennywood Loop?)
> .
> .
> .




http://lists.dementia.org/files/pittsburgh-railways/RR%20Double%20Point%20Turnout%20096.jpg 


http://lists.dementia.org/files/pittsburgh-railways/03-Tylerdale%200096%20195xxxxx%20RSchramm.jpg 



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