Class D-3 (Locobase 1160)

13-engine double-cab (camelback) class, 7 by Alco-Schenectady (500-503, 557-559), 2 by Alco-M (560-561), and 5 at D&H (504-508). Data from table in July 1904 AERJ. Firebox heating surface included 78.54 sq ft of arch tubes.

All were modified often. Ultimately, they all had 22" diameter cylinders, a weight on the drivers of 156,800 lb (except 504 & 507, which had 149,650 lb), and a total engine weight of 204,800 lb (504, 507 - 202,300 lb). Boiler pressures ranged from 200 psi (500-501, 506-507, and 558-559) to 210 (502), 215 (504-505), and 225 psi (503, 508, 557, 560-561). Tractive efforts in final form ranged from 30,150 lb to 34,000 lb.

Class D-3a (Locobase 1161)

Of the 4 locomotives that originally formed this class, only 1 -- 521 -- remained a Camelback when the railroad superheated the quartet. Her data is shown on Locobase 5297.

These 3 (builder's numbers 26908-10) plus 3 others from other D-3 subgroups, had their cabs moved back to a conventional position. More important, perhaps, boiler pressure went up to 225 psi and the cylinders were enlarged by an inch. In the superheated form, steam admission was through 14" piston valves actuated by Walschaerts gear. Valve travel was 7".

See http://www.rr-fallenflags.org/dh/dh-stm-s10.gif (viewed 26 Dec 2002) for diagram and full details.

Class D-3a (Locobase 5297)

See http://www.rr-fallenflags.org/dh/dh-stm-s09.gif (viewed 26 Dec 2002) for diagram and full details.

One of a 4-engine double-cab (Camelback) class. Of these, 521 (builder's number 26907) was least modified when superheated, keeping her original cylinders and boiler pressure as well as the camelback cab arrangement. Her piston valves were actuated by Stephenson link and had a maximum 5 1/2" of travel

521 was scrapped in 1940. It is that configuration that is seen in this entry. The other three are coved in Locobase 1161.

Class D-3b (Locobase 4955)

Although classed D-3b along with the mainline engines profiled in Locobase 1162 and 1160, this set operated solely on the Chateaugay branch between Plattsburgh and Lake Placid, New York. Firebox heating surface included 17.17 sq ft of arch tubes. Builder's numbers ranged from 49656-49661.

http://www.rr-fallenflags.org/dh/dh-stm-sxx.gifl (viewed 26 December 2002 -- note that the xx means various pages) provides the Delaware & Hudson's locomotive diagrams and tells us that these were circumstantially fueled. From April 1 to November 1 of each year they were required to burn oil to protect the forests from the flaming coal embers.

Just one of the class was superheated; see Locobase 4956.

Class D-3b (Locobase 1162)

Class with both double-cab (camelback) (535-557) and single-cab layouts.

The helpful folks at http://www.rr-fallenflags.org/dh/dh-stm-sxx.gifl (viewed 26 December 2002 -- note that the xx means various pages) provide the Delaware & Hudson's locomotive diagrams outlining many of the variations.

According to Drury (1993), featured variations in weight on the drivers and total weight. 534, 558-559 (Alco built in 1907) put 143,000 lb on the drivers. 535-544, built by the D&H in 1905-1906, 130,000 lb; 545-557 (Alco in 1907), 134,000 lb; 590-594 (Alco, 1911), 146,000 lb; and 599 (Alco, 1911), 147,500. 599 had 23 x 26 cylinders, 170-psi boiler.

The Alco engines were fitted with equipment from component suppliers as follows:

Bell ringer Sansom

Boiler lagging Magnesia sectional, Keasbey & Mattlson

Brake-beams Simplex

Brake-shoes Perfecto

Couplers Gould

Headlights Dressel

Injector Hancock for 10 ten-wheelers; Sellers Composite for 5 ten-wheelers

Piston rod packings Trojan

Valve rod packing Trojan

Sanding devices Leach

Sight-feed lubricators Nathan

Springs National

Steam gages Ashcroft

Steam heat equipment Consolidated

Tire, driving wheel Midvale

truck wheel Midvale

tender wheel Mldvale

4 engines (536, 546, 549, and 556) later received 22 x 26" cylinders.

Locobase has three entries:

1) This one, which represents the original, saturated-steam product;

2) The superheated variant (Locobase 4954) , and

3) The Chateaugay-branch subclass (Locobase 4955).

Most were scrapped in the late 1930s and 1940s, with 546 the last under the torch in 1952.

Class D-3b - superheated (Locobase 4956)

http://www.rr-fallenflags.org/dh/dh-stm-sxx.gifl (viewed 26 December 2002 -- note that the xx means various pages) .

This appears to be the one Chateaugay-branch locomotive (Locobaser 4955) that was superheated. Note, too, that the cylinder diameter was increased by 2".

Firebox heating surface included 17.17 sq ft of arch tubes.

Class D-3b - superheated - small (Locobase 4954)

This class of Ten-wheelers fissioned into several sub-classes, included superheated versions of the original design.

http://www.rr-fallenflags.org/dh/dh-stm-sxx.gifl (viewed 26 December 2002 -- note that the xx means various pages) provides the Delaware & Hudson's locomotive diagrams outlining many of the variations.

Locobase has three entries:

1) 1162, which represents the original, saturated-steam product;

2) This one, which includes those superheated engines that also received slightly larger cylinders, and

3) The Chateaugay-branch subclass (4955).

Several slightly older D-3as were modified to these boiler dimensions as well.

Most were scrapped in the late 1930s and 1940s, with 546 the last under the torch in 1952.

Class L-1 (Locobase 8367)

Data from D&HCo 1901 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive collection.

These two Schenectady engines are described in the books as Moguls, but the diagram clearly shows them to be Ten-wheelers. They came on the road in 1872 and were rebuilt by Green Island in 1891. The dimensions, heating surface areas, and weights are very close to the Class O Moguls (Locobase 8366) and Locobase wonders if they shared the same boilers.