RE: [CBQ] Interpreting a track chart bridge callout?

[GLEN HAUG <glenehaug@msn.com>]

Randy:
 
It appears you are referring to Bridge 0.91 over Salt Creek on the Prague (Schuyler) branch.  The length shown on my records is 406 feet.  According to the alignment chart, it consists of a 132' thru truss span and 18 spans of wood pile trestle.  The wood spans were 13 spans of 14 feet, 3 spans of 20 ft, one 17' span and one 11' span.  The length shown for the truss is center to center of end pins or end floor beams, and you need to add about a foot on each end to account for the total length over the stub stringers that cantilevered out beyond the end floor beams.  If you total all of the figures, you get very close to 406'.  I'm not sure about the orientation of the spans, except that I know the truss span was over the creek.  Sp. stands for span.  P.T. stands for pile trestle.  P.T. was sometimes substituted for W.P.T.
 
I'm almost certain that the pile trestle spans in this bridge were wood.  Although the Q alternated between using P.T. and W.P.T. to designate wood pile trestles, they would have used the symbol C.P.T. if the trestle spans were concrete.
 
If the span orientation is really important, let me know, and I will see if there is a bridge schematic (tingwall drawing) for this bridge.  The wood spans would have been constructed according to a standard plan, but since there was a steel span in the bridge, a schematic might exist.
 
Glen Haug
 

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To: cbq@yahoogroups.com
From: randy@prototrains.com
Date: Sat, 26 Jan 2013 20:58:59 -0600
Subject: [CBQ] Interpreting a track chart bridge callout?

 

Hi all,

On the track alignment chart, the Salt Creek Bridge at Ashland is
called out

1-17' 1-11' 3-20' 13-14' Sp.P.T. 1-132'Th.Tr.

I can see that the 1-132'Th.Tr. is the main through truss bridge, but
what is the significance of the rest? The alignment chart key says
F.T. is Frame Trestle and W.P.T. is Wood Pile Trestle, but doesn't
say what Sp. means. Or the significance of the numbers, which are
heights? spans? spacings?

I'll appreciate any help on this.

Thank you,

Randy
--
Randy Gordon-Gilmore
http://www.prototrains.com
randy@prototrains.com

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