Denver & Rio Grande / Rio Grande Southern 4-6-0 "Ten-Wheeler" Type Locomotives

Relatively high-pressured (for the time of construction). Cylinder size was later reduced to 20x26". Ten-Wheelers that were retired in from 1926 to 1928

http://www.sound.net/~drgw/history/drg2.htm; most data from 1899 Brooks catalogue.

Builder info from B.Rumary, 25 Kingscombe, Gurney Slade, Radstock, BA3 4TH, ENGLAND and Jeremy Lambert as supplied by Allen Stanley in March 2004. Works #3196-3205 in May 1899..

Class 540 / TF-18 (Locobase 7627)

Data from WP 2 - 1946 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive collection.

The Denver & Rio Grande roster presented by M. Keith Williams on http://www.drgw.org/data/steam/roster/drg008.htm (accessed 3 July 2006) shows that Rome delivered 10 of these in two batches. 540-545 were works# 536-541 and were produced in 1889-1890. A year later 546-549 (works# 672-675) were added.

Most were retired in the mid1920s. 543 was sold to Deep Creek Railway as their #1 in 1916. 546 served the Rio Grande for 15 years before being sold to the Western Pacific as their 126; #675 also went to the WP in the same sale as 127. The WP almost immediately sold 126 to its subsidiary, the Tidewater Southern, which reduced the driver diameter to 55" and increased the calculated tractive effort to 19,228 lb. Frank Brehm's WP roster Ť

http://www.wplives.com/motivepower/srosters/Class_126_Roster__/class_126_roster__.html, accessed 3 July 2006, says that the 126 stayed in service with the TS as their #1 until 1947. Sister 127 (works #675) was withdrawn in 1923 and scrapped in 1930.

Class T-19-85 (Locobase 6820)

Data from D&RGW 12 - 1937 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive collection.

These Ten-wheelers arrived on the iron of the E & CC RR, a small narrow-gauge line taken over by the Rio Grande Southern in 1916

Class T-31 (Locobase 1456)

Data from 1937 D & RGW locomotive diagram book supplied in May 2005 by Allen Stanley from his extensive collection.

Similar to the T-31 Ten-Wheelers of 1902, but intended for faster service and mounted on taller drivers. 763 had been built with 67" drivers, but was re-fitted with 63" sometime later, becoming a T-31 in the process. Scrapped over a decade from 1939-1948. Engine numbers reflect D&RGW renumbering in 1924.

http://www.sound.net/~drgw/history/drg2.htm

Specifications
Class		540 / TF-18	T-19-85	T-31
Locobase ID	2968	7627	6820	1456
Railroad	Denver & Rio Grande (D&RGW)	Denver & Rio Grande (D&RGW)	Rio Grande Southern (D&RGW)	Denver & Rio Grande (D&RGW)
Whyte	4-6-0	4-6-0	4-6-0	4-6-0
Road Numbers	720-729	540-549	20-25	760-793
Gauge	Std	Std	3'	Std
Builder	Brooks	New York	Schenectady	Alco-Schenectady
Year	1899	1889	1899	1908
Valve Gear	Stephenson	Stephenson	Stephenson	Stephenson
	Locomotive Length and Weight
Driver Wheelbase	13'	11.71'	9.75'	13.50'
Engine Wheelbase	23.58'	22.04'	18.17'	24.42'
Ratio of driving wheelbase to overall engine wheebase	0.55	0.53	0.54	0.55
Overall Wheelbase (engine & tender)	53.89'	48.96'	41.75'	66.75'
Axle Loading (Maximum Weight per Axle)		30800 lbs		49000 lbs
Weight on Drivers	124000 lbs	97400 lbs	69000 lbs	145000 lbs
Engine Weight	160000 lbs	114800 lbs	85000 lbs	184000 lbs
Tender Light Weight	115000 lbs	83986 lbs	51600 lbs	147400 lbs
Total Engine and Tender Weight	275000 lbs	198786 lbs	136600 lbs	331400 lbs
Tender Water Capacity	5500 gals	3500 gals	2500 gals	7000 gals
Tender Fuel Capacity (oil/coal)	10 tons	1836 gals	5 tons	15 tons
Minimum weight per yard of rail on which locomotive could run	68.89 lb rail	54.11 lb rail	38.33 lb rail	80.56 lb rail
	Geometry Relating to Tractive Effort
Driver Diameter	63"	60"	42"	67"
Boiler Pressure	210 psi	160 psi	180 psi	200 psi
Cylinders (dia x stroke)	21" x 26"	18" x 24"	16" x 20"	21" x 26"
Tractive Effort	32487 lbs	17626 lbs	18651 lbs	29093 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort)	3.82	5.53	3.70	4.98
	Heating Ability
Firebox Area	165 sq. ft	124 sq. ft	86.88 sq. ft	193 sq. ft
Grate Area	33.50 sq. ft	24.30 sq. ft	14.08 sq. ft	33.60 sq. ft
Evaporative Heating Surface	2422	1778	1124	2188
Superheating Surface				391
Combined Heating Surface	2422	1778	1124	2579
Evaporative Heating Surface/Cylinder Volume	232.37	251.54	241.50	209.92
	Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation	7035	3888	2534.40	6720
Same as above plus superheater percentage	7035	3888	2534.40	7738.81
Same as above but substitute firebox area for grate area	34650	19840	15638.40	44452.11
Power L1	6869.15	5427.96	4218.94	14296.23
Power MT	366.38	368.58	404.40	652.09