[CBQ] Interpreting a track chart bridge callout?

[Randy Gordon-Gilmore <randy@prototrains.com>]

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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