Re: ICC map abbreviations

Posted by Rick Steele on May 13, 2015; 2:40pm
URL: http://c-sng-discussion-forum.254.s1.nabble.com/ICC-map-abbreviations-tp2242p2244.html

The Items that you describe are just that, box culverts. If they were corrugated pipe, they would read "corr. i pipe".

You usually only find the PT and PC and PCC on the main line tracks:

They stand for:

Point of Tangency
Point of Curvature
Point of Compound Curvature.

If you look closely at the map, you will see where these lie in terms of feet and inches from the 0.0 measuring point. For Example, all of the Clear Creek 3' gauge lines were measured from Golden, not Denver. You will see the notation on the main line of  "0" through, in some cases "1300" or more. If you do the math with the milepost locations, you will see that they are generally around 5,280 feet, although I have seen some that subtract out to 7,000 and some less. Generally this is because there was a line change or some sort of relocation.

Inside of the curve you will see a triangle and that will give you the degrees and minutes of the curve. The notations on the P.C. or P.C.C. will give you the length of the legs of the triangle.

PS stands for Point of Switch.

The surveyors took notes and then drew the notes up in Denver. On the field notes it also notes what kind of ties there are on any particular track (Pine, Oak, Hardwood) their condition and the number. The field notes also note what kind of rail, year, weight and manufacturer and how much wear to calculate the cost of the rail. Remember, this was all about taxation.

HB stands for Heel Block, not Head Block. All turnouts have Heel Blocks.

Rick