Re: Deciphering ICC Valuation Maps

Posted by Todd Hackett on Jun 20, 2021; 9:32pm
URL: http://c-sng-discussion-forum.254.s1.nabble.com/Deciphering-ICC-Valuation-Maps-tp16756p16757.html

"1803+04(small o raised up here) 12' X 12' Box 18'"
You're probably correct about it being a box culvert. The 1803+04 is the station number, which is the distance from a reference point along the centerline of the track in hundreds of feet plus feet, so this is 180,304 feet (or a bit over 34 miles) from station 0+00. If there's a raised underlined numeral after it, that's probably tenths of a foot, so 180,304.0 feet from station 0+00.

"What does P.T. and P.C. mean?-related to curves-PT is at the beginning of the curve and PC at the end"
P.T. is the Point of Tangency, which is the end of a curve and beginning of a tangent. The PC is Point of Curvature, which is the end of a tangent and beginning of a curve. They just mark the ends of a curve, with the beginning and end based on increasing distance from the reference (i.e. the PC should have a smaller station number than the PT). There's also a PCC, which I'm pretty sure is Point of Compound Curve, which is where the radius of curvature changes.

"A triangle shape is used in several spots too."
Can you give an example? If you're talking about the diamonds, I'm pretty sure those are mileposts.

"At a water tank (Tunnel Gulch) it says 1776+22 (small raised o) 15 W. Tank"
The "1776+22 with the raised 0 is the station number for the tank location. I'm not sure about the "15". Maybe 15,000 gallons.

"Occasionally, a sign is listed.  Sign "W" I assumed would be for whistle?"
That's what I'd assume as well.