This class had many fathers: 10 (original numbers 684-693) from Rhode Island Locomotive Works, 1 from Brooks, 10 from Cooke (721-730), 10 from Grant (works #1723-1731 produced in December 1887, road numbers 731-740).
| Specifications | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Class | H3 | H3 | H3 | H3 | H4 | H5 | H5 - long pattern | H5 - long pattern | H5 - short pattern | H6 | H7 | H7 | H8 |
| Locobase ID | 9877 | 9873 | 9875 | 9876 | 9878 | 9882 | 9880 | 9881 | 9879 | 9883 | 9884 | 9886 | 9874 |
| Railroad | Milwaukee Road (CMStP&P) | Milwaukee Road (CMStP&P) | Milwaukee Road (CMStP&P) | Milwaukee Road (CMStP&P) | Milwaukee Road (CMStP&P) | Milwaukee Road (CMStP&P) | Milwaukee Road (CMStP&P) | Milwaukee Road (CMStP&P) | Milwaukee Road (CMStP&P) | Milwaukee Road (CMStP&P) | Milwaukee Road (CMStP&P) | Milwaukee Road (CMStP&P) | Milwaukee Road (CMStP&P) |
| Whyte | 4-4-0 | 4-4-0 | 4-4-0 | 4-4-0 | 4-4-0 | 4-4-0 | 4-4-0 | 4-4-0 | 4-4-0 | 4-4-0 | 4-4-0 | 4-4-0 | 4-4-0 |
| Road Numbers | 165-170 | 86-99 | 107-108 | 116-124 | 203-231 | 337-343 | 315-404 | 405-408 | 300-314 | 500-530 | 700-717 | 721-730 | 900-908 |
| Gauge | Std | Std | Std | Std | Std | Std | Std | Std | Std | Std | Std | Std | Std |
| Builder | William Mason | Taunton | Pittsburgh | Burnham, Parry, Williams & Co | Schenectady | Milwaukee | Rhode Island | Manchester | Rhode Island | several | Rhode Island | Schenectady | Rogers |
| Year | 1871 | 1873 | 1879 | 1880 | 1877 | 1893 | 1879 | 1882 | 1879 | 1886 | 1882 | 1889 | 1904 |
| Valve Gear | Stephenson | Stephenson | Stephenson | Stephenson | Stephenson | Stephenson | Stephenson | Stephenson | Stephenson | Stephenson | Stephenson | Stephenson | Stephenson |
| Locomotive Length and Weight | |||||||||||||
| Driver Wheelbase | 7.25' | 7.50' | 8' | 8' | 8.50' | 8.50' | 8.50' | 8.50' | 8.50' | 8.50' | 8.50' | 8.50' | 8' |
| Engine Wheelbase | 21.33' | 21.50' | 21.67' | 21' | 22.50' | 22.33' | 23.25' | 23.25' | 22.75' | 23.25' | 23.25' | 23.25' | 22.83' |
| Ratio of driving wheelbase to overall engine wheebase | 0.34 | 0.35 | 0.37 | 0.38 | 0.38 | 0.38 | 0.37 | 0.37 | 0.37 | 0.37 | 0.37 | 0.37 | 0.35 |
| Overall Wheelbase (engine & tender) | 43.33' | 43.50' | 43.75' | 44.71' | 44.87' | 45.54' | 45.54' | 45.04' | 45.79' | 45.54' | 45.96' | 49.90' | |
| Axle Loading (Maximum Weight per Axle) | |||||||||||||
| Weight on Drivers | 40400 lbs | 40000 lbs | 42800 lbs | 42750 lbs | 50000 lbs | 54000 lbs | 55000 lbs | 55000 lbs | 52100 lbs | 64000 lbs | 60000 lbs | 60000 lbs | 85600 lbs |
| Engine Weight | 66650 lbs | 65700 lbs | 72700 lbs | 68550 lbs | 81000 lbs | 86000 lbs | 85000 lbs | 85000 lbs | 81220 lbs | 100100 lbs | 94000 lbs | 97000 lbs | 131000 lbs |
| Tender Light Weight | 55000 lbs | 55000 lbs | 52600 lbs | 60000 lbs | 60000 lbs | 68000 lbs | 60000 lbs | 60000 lbs | 60000 lbs | 78000 lbs | 60000 lbs | 78000 lbs | 112000 lbs |
| Total Engine and Tender Weight | 121650 lbs | 120700 lbs | 125300 lbs | 128550 lbs | 141000 lbs | 154000 lbs | 145000 lbs | 145000 lbs | 141220 lbs | 178100 lbs | 154000 lbs | 175000 lbs | 243000 lbs |
| Tender Water Capacity | 2000 gals | 2000 gals | 3200 gals | 2000 gals | 2800 gals | 3600 gals | 2700 gals | 2700 gals | 2700 gals | 3800 gals | 2700 gals | 2700 gals | 5000 gals |
| Tender Fuel Capacity (oil/coal) | 4 tons | 4 tons | 4 tons | 4.5 tons | 5 tons | 5 tons | 4.5 tons | 4.5 tons | 4.5 tons | 5 tons | 5 tons | 5 tons | 10 tons |
| Minimum weight per yard of rail on which locomotive could run | 34 lb rail | 33 lb rail | 36 lb rail | 36 lb rail | 42 lb rail | 45 lb rail | 46 lb rail | 46 lb rail | 43 lb rail | 53 lb rail | 50 lb rail | 50 lb rail | 71 lb rail |
| Geometry Relating to Tractive Effort | |||||||||||||
| Driver Diameter | 63" | 63" | 62" | 63" | 69" | 63" | 63" | 63" | 63" | 70" | 63" | 63" | 67" |
| Boiler Pressure | 130 psi | 130 psi | 130 psi | 130 psi | 140 psi | 160 psi | 140 psi | 140 psi | 140 psi | 150 psi | 150 psi | 180 psi | 180 psi |
| Cylinders (dia x stroke) | 16" x 24" | 16" x 24" | 16" x 24" | 16" x 24" | 17" x 24" | 16" x 24" | 17" x 24" | 17" x 24" | 17" x 24" | 18" x 24" | 18" x 24" | 17" x 24" | 18" x 26" |
| Tractive Effort | 10776 lbs | 10776 lbs | 10950 lbs | 10776 lbs | 11962 lbs | 13263 lbs | 13101 lbs | 13101 lbs | 13101 lbs | 14163 lbs | 15737 lbs | 16845 lbs | 19237 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.75 | 3.71 | 3.91 | 3.97 | 4.18 | 4.07 | 4.20 | 4.20 | 3.98 | 4.52 | 3.81 | 3.56 | 4.45 |
| Heating Ability | |||||||||||||
| Firebox Area | 90 sq. ft | 96 sq. ft | 92.20 sq. ft | 98 sq. ft | 120 sq. ft | 106 sq. ft | 120 sq. ft | 120 sq. ft | 120 sq. ft | 123 sq. ft | 127 sq. ft | 130 sq. ft | 148 sq. ft |
| Grate Area | 14.50 sq. ft | 14.50 sq. ft | 14.30 sq. ft | 15 sq. ft | 17.10 sq. ft | 17.50 sq. ft | 17.20 sq. ft | 17.20 sq. ft | 17.20 sq. ft | 17.50 sq. ft | 17.20 sq. ft | 17 sq. ft | 26.80 sq. ft |
| Evaporative Heating Surface | 798 | 806 | 956 | 823 | 1030 | 892 | 1090 | 1090 | 1090 | 1390 | 1215 | 1177 | 1729 |
| Superheating Surface | |||||||||||||
| Combined Heating Surface | 798 | 806 | 956 | 823 | 1030 | 892 | 1090 | 1090 | 1090 | 1390 | 1215 | 1177 | 1729 |
| Evaporative Heating Surface/Cylinder Volume | 142.88 | 144.31 | 171.17 | 147.36 | 163.36 | 159.71 | 172.88 | 172.88 | 172.88 | 196.64 | 171.89 | 186.68 | 225.79 |
| Computations Relating to Power Output (More Information) | |||||||||||||
| Robert LeMassena's Power Computation | 1885 | 1885 | 1859 | 1950 | 2394 | 2800 | 2408 | 2408 | 2408 | 2625 | 2580 | 3060 | 4824 |
| Same as above plus superheater percentage | 1885 | 1885 | 1859 | 1950 | 2394 | 2800 | 2408 | 2408 | 2408 | 2625 | 2580 | 3060 | 4824 |
| Same as above but substitute firebox area for grate area | 11700 | 12480 | 11986 | 12740 | 16800 | 16960 | 16800 | 16800 | 16800 | 18450 | 19050 | 23400 | 26640 |
| Power L1 | 3050 | 3143 | 3408 | 3209 | 4162 | 4277 | 3940 | 3940 | 3940 | 4964 | 4122 | 5477 | 6481 |
| Power MT | 332.88 | 346.46 | 351.09 | 330.98 | 367.03 | 349.23 | 315.86 | 315.86 | 333.44 | 341.99 | 302.91 | 402.49 | 333.84 |
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