Nashville, Chattanooga & St. Louis 4-6-0 "Ten-Wheeler" Type Locomotives

Class G-0-18 (Locobase 6860)

Data from NC& StL 1 - 1921 Locomotive Diagram book supplied in May 2005 by Allen Stanley from his extensive collection.

For some reason (likely because it came from a predecessor road), this single locomotive had its own class. It was bigger than the other NC & St L Ten-wheelers and carried its wider grate over the rear axles instead of between them.

Class G-0-21 (Locobase 6861)

Data from NC& StL 1 - 1921 Locomotive Diagram book supplied in May 2005 by Allen Stanley from his extensive collection.

This was a repeat of the one-off 1891 Ten-wheeler from Rogers (Locobase 6860), but with more cylinder volume, higher boiler pressure, and a slightly larger grate. Other than having a somewhat generous direct heating surface, this was a middle-of-the-pack 4-6-0 of the late 1890s.

Class G-2-18 (Locobase 6856)

Data from NC& StL 1 - 1921 Locomotive Diagram book supplied in May 2005 by Allen Stanley from his extensive collection.

Numerous Rogers Ten-wheelers for the Dixie Line that shared their deep, narrow firebox with the D-4 4-4-0s that came from the same builder at the same time. The G-2s' low drivers suggest freight applications while the unequal spacing of their drivers and the dome positioned over the firebox places them firmly in their era.

Class G-3-18 (Locobase 6857)

Data from NC& StL 1 - 1921 Locomotive Diagram book supplied in May 2005 by Allen Stanley from his extensive collection.

Contemporaneous with the Rogers G-2s (Locobase 6857), these Ten-wheelers had larger grates and boilers and a longer driving wheelbase.

Class G-4-20 (Locobase 6858)

Data from NC& StL 1 - 1921 Locomotive Diagram book supplied in May 2005 by Allen Stanley from his extensive collection.

Pittsburgh's Ten-wheeler contribution to the Dixie Line had a smaller boiler than that of the more numerous Rogers G-2 of the same year (Locobase 6856), but a larger grate and more firebox heating surface. Indeed, compared to other 4-6-0s of the same period (1884-1889), the G-4s had among the most generous amounts of firebox heating surface.

Class G-5-19 (Locobase 6859)

Data from NC& StL 1 - 1921 Locomotive Diagram book supplied in May 2005 by Allen Stanley from his extensive collection.

The Dixie Line's listing shows the first four as built in 1902 and the last in 1907. That seems very late for such modestly powered locomotives.

Class G-6A-24 (Locobase 6705)

Data from NC& StL 1 - 1921 Locomotive Diagram book supplied in May 2005 by Allen Stanley from his extensive collection.

Like the G7s, these G6s were simple-expansion from the start. Like the G8s, however, they had the larger diameter pistons and proved amenable to superheating. These weren't big Ten-wheelers, but they found work for more than 40 years before retiring in the late 1940s.

Class G-7-25 (Locobase 6704)

Data from NC& StL 1 - 1921 Locomotive Diagram book supplied in May 2005 by Allen Stanley from his extensive collection.

These were simple-expansion locomotives from the start (unlike the Baldwins (Locobase 119) that operated on the line at around the same time.

Relatively modest in power, this class served the NC & StL for about 30 years.

Class G-8A-32 (Locobase 119)

Data from NC& StL 1 - 1921 Locomotive Diagram book supplied in May 2005 by Allen Stanley from his extensive collection.

This class designation reflects the conversion of these seven Ten-Wheelers from the four-cylinder compounds they were when delivered to a simple-expansion locomotive. The result was an engine considerably more powerful than the earlier G6-24 (5 Baldwins in 1902), and G7-25 (4 Rogers in 1904). The power only increased when the NC & StL superheated the engines later on.

The G6 and G8 classes left service in 1947-1949; the G7s were retired in 1936.

Specifications
Class	G-0-18	G-0-21	G-2-18	G-3-18	G-4-20	G-5-19	G-6A-24	G-7-25	G-8A-32
Locobase ID	6860	6861	6856	6857	6858	6859	6705	6704	119
Railroad	Nashville, Chattanooga & St. Louis	Nashville, Chattanooga & St. Louis	Nashville, Chattanooga & St. Louis	Nashville, Chattanooga & St. Louis	Nashville, Chattanooga & St. Louis	Nashville, Chattanooga & St. Louis	Nashville, Chattanooga & St. Louis	Nashville, Chattanooga & St. Louis	Nashville, Chattanooga & St. Louis
Whyte	4-6-0	4-6-0	4-6-0	4-6-0	4-6-0	4-6-0	4-6-0	4-6-0	4-6-0
Road Numbers	215	216	131-167	201-203	204-207	210-214	250-254	270-273	280-286
Gauge	Std	Std	Std	Std	Std	Std	Std	Std	Std
Builder	Rogers	Rogers	Rogers	Rhode Island	Pittsburgh	Burnham, Williams & Co	Burnham, Williams & Co	Alco-Rogers	Burnham, Williams & Co
Year	1891	1898	1888	1892	1888	1902	1902	1904	1905
Valve Gear	Stephenson	Stephenson	Stephenson	Stephenson	Stephenson	Stephenson	Walschaert	Stephenson	Stephenson
	Locomotive Length and Weight
Driver Wheelbase	13'	13'	12.42'	14.42'	13.25'	14.25'	13.50'	13'	13.50'
Engine Wheelbase	23.75'	23.75'	23.25'	24.87'	24.08'	24.25'	24.50'	23.87'	26'
Ratio of driving wheelbase to overall engine wheebase	0.55	0.55	0.53	0.58	0.55	0.59	0.55	0.54	0.52
Overall Wheelbase (engine & tender)	50.12'	50.12'	44.87'	46.71'	46.17'	48.61'	52.54'	52.21'	58.12'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers	99300 lbs	105950 lbs	74500 lbs	78200 lbs	74100 lbs	87300 lbs	121500 lbs	124000 lbs	150400 lbs
Engine Weight	128000 lbs	135275 lbs	100300 lbs	105000 lbs	101000 lbs	118500 lbs	161600 lbs	161000 lbs	189900 lbs
Tender Light Weight	101600 lbs	101600 lbs	70000 lbs	72500 lbs	67000 lbs	96000 lbs	108700 lbs	107200 lbs	133320 lbs
Total Engine and Tender Weight	229600 lbs	236875 lbs	170300 lbs	177500 lbs	168000 lbs	214500 lbs	270300 lbs	268200 lbs	323220 lbs
Tender Water Capacity	4100 gals	4100 gals	2450 gals	3300 gals	3000 gals	4000 gals	5000 gals	5000 gals	6500 gals
Tender Fuel Capacity (oil/coal)	13 tons	13 tons	10.5 tons	7 tons	9 tons	13 tons	9.8 tons	8.3 tons	11.5 tons
Minimum weight per yard of rail on which locomotive could run	55.17 lb rail	58.86 lb rail	41.39 lb rail	43.44 lb rail	41.17 lb rail	48.50 lb rail	67.50 lb rail	68.89 lb rail	83.56 lb rail
	Geometry Relating to Tractive Effort
Driver Diameter	66"	66"	56"	54"	50"	62"	66"	66"	66"
Boiler Pressure	160 psi	170 psi	150 psi	150 psi	150 psi	175 psi	175 psi	190 psi	200 psi
Cylinders (dia x stroke)	19" x 24"	19" x 26"	18" x 24"	18" x 24"	18" x 24"	18" x 24"	22" x 26"	20" x 26"	22" x 26"
Tractive Effort	17853 lbs	20550 lbs	17704 lbs	18360 lbs	19829 lbs	18656 lbs	28362 lbs	25448 lbs	32413 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort)	5.56	5.16	4.21	4.26	3.74	4.68	4.28	4.87	4.64
	Heating Ability
Firebox Area	168.96 sq. ft	175.73 sq. ft	107.95 sq. ft	143.83 sq. ft	144.33 sq. ft	131.71 sq. ft	187 sq. ft	187.77 sq. ft	185 sq. ft
Grate Area	28.30 sq. ft	27.79 sq. ft	15.03 sq. ft	19.50 sq. ft	17 sq. ft	17.90 sq. ft	34.58 sq. ft	28.99 sq. ft	34.86 sq. ft
Evaporative Heating Surface	1896	1900	1365	1463	1312	1556	1723	2042	2326
Superheating Surface							320		456
Combined Heating Surface	1896	1900	1365	1463	1312	1556	2043	2042	2782
Evaporative Heating Surface/Cylinder Volume	240.74	222.69	193.11	206.97	185.61	220.13	150.62	216.00	203.34
	Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation	4528	4724.30	2254.50	2925	2550	3132.50	6051.50	5508.10	6972
Same as above plus superheater percentage	4528	4724.30	2254.50	2925	2550	3132.50	6999.36	5508.10	8114.79
Same as above but substitute firebox area for grate area	27033.60	29874.10	16192.50	21574.50	21649.50	23049.25	37850.80	35676.30	43064.70
Power L1	6124.85	6090.02	3772.54	4167.60	3596.28	5665.41	9319.42	6589.87	14145.25
Power MT	407.94	380.17	334.91	352.48	320.99	429.21	507.30	351.49	622.04