UF, F 7/19/1864
Office of Engineer and Superintendent Florida Railroad
Gainesville July 19th 1864
 
Hon. D. L. Yulee
 
DSir,
   The following table will give you a very correct idea of the effect of gradients on the capability of railways; and will answer your question proposed this morning. The Engine and road are supposed to be in the best order; and unless these conditions be fulfilled some deduction must be made from the calculated performance in the table: -- But the ratio of the performances on the several grades are practically constant.
I am Sear Sir
very respectfully
Your Ob. St.
R D Meador
 
Capacity of a 20 ton (40,000 lbs) Locomotive Engine
Grade per Mile Tractional Value of Grade Gravity per ton in pounds Traction per ton in pounds Total Resistance per ton pounds Adhesion in pounds Total tons carried, including Engine Tons Exclusive of Engine Carried Loaded cars of 16 Tons Carried Practically, the following results may be more reliable
Level 0/0 0.0 8.0 8.0 8888 1111 1091 68 48 loaded freight cars
5 feet 1/1056 1.9 " 9.9 " 898 878 55 40
10  "   1/528 3.8 " 11.8 " 753 733 45 35
15  "   1/352 5.7 " 13.7 " 649 629 39 30
20  "   1/264 7.6 " 15.6 " 570 550 34 27
25  "   1/211 9.5 " 17.5 " 514 494 31 24
30  "   1/176 11.4 " 19.4 " 458 438 27 22
35  "   1/151 13.2 " 21.2 " 419 399 25 20
40  "   1/132 15.2 " 23.2 " 383 363 23 18
45  "   1/117 17.1 " 25.2 " 352 332 21 17
50  "   1/105 19.0 " 27.0 " 329 309 19 16
55  "   1/96 20.8 " 28.8 " 308 288 18 15
60  "   1/88 22.7 " 30.7 " 290 270 17 14
{Heading to the next to the last column should be for 8 Tons; no car was loaded to 16 tons}

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