P 204
Arizona Divide, October 20th, 1880
Henry R. Holbrook, Esq.,
Chief Engineer A&P Ry.,
Albuquerque, N.M.
Dear Sir:
In looking over my Profile and studing the question of grades, I find it necessary to give you a Supplementary Report on Grades for the Second Division, east of the Colorado River. This includes all of the Second One Hundred Miles east of Peach Spring and also 6.9 miles from the Second One Hundred Mile post east to a point near Volunteer Spring. This is all one Ooperating Division. Peach Spring flows 1721 gallons per hour. Volunteer Springs of which there are three. The largest is on Sec. 11, T.21N,R6E and flows 128 gallons per hour. Mr. Hill who has a cabin and sheep ranch holds the next largest which flows 81 gallons per hour. The water is excellent. I passed these springs last May when they flowed much larger owing to the melting of snow, I presume, in Larow Park.
Opposite these springs the ground lays very well for Side track and yards could not be better. The grades are favorable with very little work.
Your letter of August 26th, 1880 gave Poors Report on through freight on the Union Pacific Railroad as 111,394 tons, going west and 68,826 tons coming east. It is said and I believe acknowledged that on American Railroads cars are only loaded to 2/3 their capacity; this being a through line, it is perhaps safer to assume the cars to be loaded to their full capacity.
The freight going west requires 11,139 cars, weighing 10 tons each. To adjust our grades to an unequal traffic we must obtain the gross load each way, and not the net load. This includes for above west bound freight, its weight 111,394 tons, the weight of 11,139 cars of 111,394 tons and that portion of the Engine not on the drivers, of each train, As the average engine weighs say 50 tons, 55% rests on the drivers, the balance 22.5 tons is a part of our gross load. This engine hauls 11 cars on 100ft. grades, so to every 11 cars we must increase our gross load by 22.5 tons, which, for the 111,394 tons of west bound freight is 22,783 tons. Thus our load 111,394 tons our cars 111,394 tons and engine not on drivers 22783 tons together gives us our gross load and is 245571 tons going west. As our cars and engines have all got to come back we must add the last two items of the above to the net load coming east and we shall have the gross load coming east which is 203003 tons. We then have - 245571 is to 203003 as 1000 is to 826. By Trautwines P.412 we have 95 ft. to a 75' grade as 204 to 258 or as 790 to 1000. By Trautwines p. 412 we have 95 ft. to a 80' grade as 204 to 242 or as 842 to 1000. Hence by Mr. Trautwines table we have - 826 to 1000 as 95' grades east to 78.5 grade west.
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