This sextet was a repeat of the D-26s that entered service a year before. The big difference was a 1" increase in cylinder diameter. Four of the D-29s had 63" drivers as shown while two had 69" drivers.
This large class of Eight-wheelers was built for the Wabash in two driver sizes; the other 18 69" engines are described in Locobase 6911. In both sizes, production extended over a decade and more.
This large class of Eight-wheelers was built by the Wabash itself in two driver sizes; the other 25 63" engines are described in Locobase 6910. The railroad produced the class over a long period of more than 10 years.
While the Wabash was building its own large D-22 class (Locobase 6910-6911), it was buying this class from the outside. The principal difference was a slightly longer set of boiler tubes whose number had increased by 4.
This small set of Eight-wheelers was noticeably bigger than the D-22s and D-26s. The basic power dimensions remained the same, but boiler pressure increased and 70 additional tubes crowded the vessel.
A year after Baldwin delivered the Wabash's 77" express Eight-wheelers, the builder came back with these two 73" of substantially different proportions. The sloping grate was much bigger, but the firebox was shallower because it now sat above the plane of the driving axles. The boiler was almost perfectly cylindrical, and contained 44 more tubes of slightly greater length.
As the Wabash wound down its production of the 17" x 24" D-22s, it began delivering an updated design with 18" cylinders, a larger boiler pressed to 175 psi, a smaller grate, but enough firebox area to put it near the top of contemporary US Eight-wheelers. Sometime later, 11 sq ft of arch tubes was added to the firebox heating surface, increasing it to 158 sq ft.
These were the first Wabash Eight-wheelers that had express-engine drivers. The class was split into two groups; this one, with 73" drivers, and a set by Baldwin with 77" drivers (see Locobase 6917). A later addition of 11 sq ft of arch tubes raised the firebox heating surface to 177 sq ft.
LIke the Rhode Island 73" engines described in Locobase 6916, these Eight-wheelers with true express-engine drivers. The diagram for these Baldwins shows a surprisingly lean-looking locomotive whose outsized drivers are offset by a long, high-pitched boiler barrel. As with the Rhode Island engines, the Wabash later added 11 sq ft to the firebox heating surface, increasing it to 177 sq ft.
| Specifications | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Class | D-28 | D22 - 63"" | D22 - 69"" | D26 | D27 | D31 | F / D29 | H / D30 - 73"" | H / D30 - 77"" |
| Locobase ID | 6914 | 6910 | 6911 | 6912 | 6913 | 6918 | 6915 | 6916 | 6917 |
| Railroad | Wabash | Wabash | Wabash | Wabash | Wabash | Wabash | Wabash | Wabash | Wabash |
| 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 |
| Road Numbers | 262-265 | 1 | 314 | 262-265 | 255-256 | 118 | 652-655 | 656-660 | |
| Gauge | Std | Std | Std | Std | Std | Std | Std | Std | Std |
| Builder | Rhode Island | Wabash | Wabash | Rhode Island | Rhode Island | Burnham, Williams & Co | Wabash | Rhode Island | Burnham, Williams & Co |
| Year | 1880 | 1879 | 1879 | 1879 | 1894 | 1900 | 1892 | 1899 | 1899 |
| Valve Gear | Stephenson | Stephenson | Stephenson | Stephenson | Stephenson | Stephenson | Stephenson | Stephenson | Stephenson |
| Locomotive Length and Weight | |||||||||
| Driver Wheelbase | 8.50' | 8.67' | 8.67' | 8.50' | 8.50' | 8.50' | 8.50' | 9' | 9' |
| Engine Wheelbase | 23.39' | 22.82' | 22.82' | 23.20' | 22.83' | 23.58' | 24.31' | 24.74' | 24.74' |
| Ratio of driving wheelbase to overall engine wheebase | 0.36 | 0.38 | 0.38 | 0.37 | 0.37 | 0.36 | 0.35 | 0.36 | 0.36 |
| Overall Wheelbase (engine & tender) | 46.29' | 45.13' | 45.13' | 45.67' | 45.21' | 47.44' | 47.44' | ||
| Axle Loading (Maximum Weight per Axle) | 29550 lbs | 29000 lbs | 29000 lbs | 30000 lbs | 30442 lbs | 41155 lbs | 41155 lbs | ||
| Weight on Drivers | 57250 lbs | 55000 lbs | 55000 lbs | 57000 lbs | 61000 lbs | 80000 lbs | 60800 lbs | 79505 lbs | 79505 lbs |
| Engine Weight | 91900 lbs | 87000 lbs | 87000 lbs | 87000 lbs | 98000 lbs | 126000 lbs | 98121 lbs | 122905 lbs | 122905 lbs |
| Tender Light Weight | 96300 lbs | 75500 lbs | 75500 lbs | 75500 lbs | 69000 lbs | 92750 lbs | 76225 lbs | 96300 lbs | 96300 lbs |
| Total Engine and Tender Weight | 188200 lbs | 162500 lbs | 162500 lbs | 162500 lbs | 167000 lbs | 218750 lbs | 174346 lbs | 219205 lbs | 219205 lbs |
| Tender Water Capacity | 4500 gals | ||||||||
| Tender Fuel Capacity (oil/coal) | 10 tons | tons | |||||||
| Minimum weight per yard of rail on which locomotive could run | 48 lb rail | 46 lb rail | 46 lb rail | 48 lb rail | 51 lb rail | 67 lb rail | 51 lb rail | 66 lb rail | 66 lb rail |
| Geometry Relating to Tractive Effort | |||||||||
| Driver Diameter | 63" | 63" | 69" | 69" | 69" | 73" | 69" | 73" | 77" |
| Boiler Pressure | 150 psi | 150 psi | 150 psi | 150 psi | 180 psi | 190 psi | 175 psi | 185 psi | 185 psi |
| Cylinders (dia x stroke) | 18" x 24" | 17" x 24" | 17" x 24" | 17" x 24" | 17" x 24" | 19" x 26" | 18" x 24" | 18.5" x 26" | 18.5" x 26" |
| Tractive Effort | 15737 lbs | 14037 lbs | 12817 lbs | 12817 lbs | 15380 lbs | 20765 lbs | 16763 lbs | 19168 lbs | 18173 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.64 | 3.92 | 4.29 | 4.45 | 3.97 | 3.85 | 3.63 | 4.15 | 4.37 |
| Heating Ability | |||||||||
| Firebox Area | 118 sq. ft | 131 sq. ft | 131 sq. ft | 118 sq. ft | 129 sq. ft | 162 sq. ft | 147 sq. ft | 165.90 sq. ft | 165.90 sq. ft |
| Grate Area | 17 sq. ft | 17.30 sq. ft | 17.30 sq. ft | 17 sq. ft | 17.50 sq. ft | 34 sq. ft | 16.50 sq. ft | 18.12 sq. ft | 18.12 sq. ft |
| Evaporative Heating Surface | 1222 | 1177 | 1177 | 1222 | 1589 | 2162 | 1362 | 1759 | 1759 |
| Superheating Surface | |||||||||
| Combined Heating Surface | 1222 | 1177 | 1177 | 1222 | 1589 | 2162 | 1362 | 1759 | 1759 |
| Evaporative Heating Surface/Cylinder Volume | 172.88 | 186.68 | 186.68 | 193.81 | 252.02 | 253.40 | 192.68 | 217.46 | 217.46 |
| Computations Relating to Power Output (More Information) | |||||||||
| Robert LeMassena's Power Computation | 2550 | 2595 | 2595 | 2550 | 3150 | 6460 | 2888 | 3352 | 3352 |
| Same as above plus superheater percentage | 2550 | 2595 | 2595 | 2550 | 3150 | 6460 | 2888 | 3352 | 3352 |
| Same as above but substitute firebox area for grate area | 17700 | 19650 | 19650 | 17700 | 23220 | 30780 | 25725 | 30692 | 30692 |
| Power L1 | 4037 | 4576 | 5012 | 4957 | 7334 | 8052 | 5970 | 7203 | 7597 |
| Power MT | 310.92 | 366.85 | 401.80 | 383.45 | 530.12 | 443.79 | 432.95 | 399.47 | 421.32 |
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