Erie 4-4-2 "Atlantic" Type Locomotives

Class E-1 (Locobase 426)

Data from Erie 1907 locomotive diagram book supplied in May 2005 by Allen Stanley from his extensive collection.

Twenty-nine Camelback Vauclain compounds delivered with two 13" HP and two 22" LP cylinders. They were shortly (1904-1906) converted to single-expansion engines.

Retired in 1927-1928.

Class E-2 (Locobase 387)

Originally built as compounds with 15-in high-pressure and 25-in low pressure cylinders. Biggest differences from later E3 were much larger grate and slightly higher boiler pressure.

Data from Erie's 1928 Locomotive Diagram book supplied in May 2005 by Allen Stanley from his extensive collection.

Class E-3 - compound (Locobase 9481)

Data from Angus Sinclair (ed), Railway and Locomotive Engineering, May 1903, p. 217.

These engines were originally built as Vauclain compounds with 15-in high-pressure and 25-in low pressure pistons. They were later rebuilt as simple-expansion engines; they're shown in that configuration in Locobase 386.

Class E-3 - simple (Locobase 386)

These engines were originally built as compounds with 15-in high-pressure and 25-in low pressure pistons; see Locobase 9481. When rebuilt as simple-expansion engines, they seem to have disposed of some of their 2" tubes and, of course, the two LP cylinders, but were otherwise unchanged

Data from Erie's 1928 Locomotive Diagram book supplied in May 2005 by Allen Stanley from his extensive collection.

Class E-4 (Locobase 388)

Data validated and expanded by table in June 1906 AERJ. Fireboxe heating surface includes 26 sq ft of arch tubes.

Large Atlantics of which only these 2 Baldwins and a similar Alco were built, probably because interest was turning to a 4-6-2 arrangement for passenger power. Later converted to simple expansion with 2 22 1/2" -diameter cylinders and 74 1/2" drivers, which matched the lone Alco.

Class E-4 - superheated (Locobase 9239)

Data from Westing's Erie Power (1970) and Erie 7-1949-1 locomotive diagram book supplied in May 2005 by Allen Stanley from his extensive collection. Firebox heating surface area included 4 arch tubes that contributed 25 sq ft.

This set of relatively long Atlantics was simpled, then superheated at the Hornell Shops with what may have been a standard kit. As with the later E-5 makeover (Locobase 9238), the E-4s didn't sacrifice much in the way of heating surface area. The 12" piston valves, Baker valve gear, and superheat enlivened the design and the two locomotives lasted into the late 1940s.

Class E-5 (Locobase 389)

Similar in concept and performance to Baldwin-built E4s. Data from a table in the June 1907 AERJ.

Although a significant increase in Atlantic engine power, these 2 classes were the last of this wheel arrangement to be built for the Erie. They were later converted to 2-cylinder simples -- 22 1/2" x 26" turning 74 1/2" drivers.

Class E-5 - superheated (Locobase 9238)

Data from Westing's Erie Power (1970) and Erie 7-1949-1 locomotive diagram book supplied in May 2005 by Allen Stanley from his extensive collection.

For not a lot of increase in weight, the Erie's newest Atlantic was rebuilt at the Hornell Shops. At first it was simpled (although Locobase can't say for sure when) then superheated. Unlike many upgrades, the loss in overall heating surface area was not substantial and its boiler pressure remained set at 200 PSI. 25 sq ft of the firebox heating surface came in the form of 4 arch tubes.

Specifications
Class	E-1	E-2	E-3 - compound	E-3 - simple	E-4	E-4 - superheated	E-5	E-5 - superheated
Locobase ID	426	387	9481	386	388	9239	389	9238
Railroad	Erie (ERR)	Erie (ERR)	Erie (ERR)	Erie (ERR)	Erie (ERR)	Erie (ERR)	Erie (ERR)	Erie (ERR)
Whyte	4-4-2	4-4-2	4-4-2	4-4-2	4-4-2	4-4-2	4-4-2	4-4-2
Road Numbers	502-527, 532-534	934-943	545-559	545-559	535-536	535-536	537	537
Gauge	Std	Std	Std	Std	Std	Std	Std	Std
Builder	Burnham, Williams & Co	Burnham, Williams & Co	Burnham, Williams & Co	Burnham, Williams & Co	Burnham, Williams & Co	Erie	Alco-Schenectady	Erie
Year	1899	1902	1903	1903	1905	1917	1905	1919
Valve Gear	Stephenson		Stephenson		Walschaert	Baker	Stephenson	Stephenson
	Locomotive Length and Weight
Driver Wheelbase	6.58'	6.58'	6.58'	6.58'	7'	7'	7'	7'
Engine Wheelbase	24.75'	26.25'	26.25'	26.25'	30.08'	30.17'	28.75'	28.67'
Ratio of driving wheelbase to overall engine wheebase	0.27	0.25	0.25	0.25	0.23	0.23	0.24	0.24
Overall Wheelbase (engine & tender)	52.79'	53.92'	52.17'	55.17'	59.87'	57.62'	60.75'	57.08'
Axle Loading (Maximum Weight per Axle)	41800 lbs	42000 lbs	49400 lbs	49400 lbs	61400 lbs	53955 lbs	57550 lbs	56500 lbs
Weight on Drivers	75800 lbs	80800 lbs	88000 lbs	92300 lbs	115500 lbs	105280 lbs	115000 lbs	110050 lbs
Engine Weight	155100 lbs	169500 lbs	180000 lbs	178800 lbs	204200 lbs	201000 lbs	206000 lbs	204200 lbs
Tender Light Weight	116800 lbs	137000 lbs	130000 lbs	137000 lbs	155000 lbs	137000 lbs	162800 lbs	137000 lbs
Total Engine and Tender Weight	271900 lbs	306500 lbs	310000 lbs	315800 lbs	359200 lbs	338000 lbs	368800 lbs	341200 lbs
Tender Water Capacity	6000 gals	6800 gals	6800 gals	6800 gals	8500 gals	6800 gals	8500 gals	6800 gals
Tender Fuel Capacity (oil/coal)	12 tons	14 tons	14 tons	14 tons	12 tons	14 tons	16 tons	14 tons
Minimum weight per yard of rail on which locomotive could run	63 lb rail	67 lb rail	73 lb rail	77 lb rail	96 lb rail	88 lb rail	96 lb rail	92 lb rail
	Geometry Relating to Tractive Effort
Driver Diameter	76"	76"	76"	76"	72"	68"	78"	68"
Boiler Pressure	200 psi	210 psi	200 psi	200 psi	225 psi	200 psi	220 psi	200 psi
Cylinders (dia x stroke)	18" x 26"	19" x 28"	15" x 28"	19" x 28"	16" x 26"	22.5" x 26"	15.5" x 26"	22.5" x 25"
Tractive Effort	18843 lbs	23741 lbs	20724 lbs	22610 lbs	26170 lbs	32906 lbs	22098 lbs	31641 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort)	4.02	3.40	4.25	4.08	4.41	3.20	5.20	3.48
	Heating Ability
Firebox Area	160 sq. ft	201 sq. ft	172 sq. ft	177 sq. ft	207 sq. ft	206 sq. ft	181.10 sq. ft	206 sq. ft
Grate Area	64 sq. ft	76 sq. ft	46.90 sq. ft	46.90 sq. ft	54 sq. ft	54 sq. ft	56.50 sq. ft	56.40 sq. ft
Evaporative Heating Surface	2331	2637	2811	2536	3639	2759	3632	2709
Superheating Surface						599		564
Combined Heating Surface	2331	2637	2811	2536	3639	3358	3632	3273
Evaporative Heating Surface/Cylinder Volume	304.40	286.99	490.84	276.00	601.44	230.59	639.64	235.47
	Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation	12800	15960	9380	9380	12150	10800	12430	11280
Same as above plus superheater percentage	12800	15960	9380	9380	12150	12960	12430	13536
Same as above but substitute firebox area for grate area	32000	42210	34400	35400	46575	49440	39842	49440
Power L1	10358	10543	5846	9432	7324	17391	8122	17367
Power MT	602.52	575.33	292.91	450.57	279.60	728.35	311.41	695.82