Canadian Pacific 4-4-0 "American" Type Locomotives

Class A1 (Locobase 6553)

Data from 1947 CP Locomotive Diagram book supplied in May 2005 by Allen Stanley from his extensive collection.

This class came out of the CP shops in September 1887 and in its original form may have looked like the locomotive described in Locobase 9065 (which see). This data shows the superheater that was added sometime after 1910.

Class A1 (Locobase 9065)

Data from Transactions of the Canadian Society of Civil Engineers By Canadian Society of Civil Engineers, v.3-4 (1889-90), the January 3, 1889 session.

As part of the CSCE President Samuel Keefer's address, he included information from Mr Brown, Mechanical Superintendent of the CPR about the standard passenger engine used by the CP east of the Rockies. Locobase suspects that this is the A1, but cannot be certain as there is no class or road number ID available nor did the A1 as superheated (Locobase 6553) use the unusual bore & stroke combination of 19" x 22"

Class A2 (Locobase 4484)

Data from 1947 CP Locomotive Diagram book supplied in May 2005 by Allen Stanley from his extensive collection.

Locobase hasn't pinned down when these small Eight-wheelers were procured, but it's clear that the A1s (Locobase 6553) and A2s were identical except for driver diameter. This group must have run local mixed trains on a relatively slow schedule. Also, this data shows the superheater that was added sometime after 1910.

Class SA (Locobase 1103)

First locomotive built by the Canadian Pacific Railroad. Some data supplied by Bill Hallett for Bryan Attewell (http://www.washingtonimaging.co.uk/index.html)'s Steam locomotive simulator (April 2000).

Specifications
Class	A1	A1	A2	SA
Locobase ID	6553	9065	4484	1103
Railroad	Canadian Pacific	Canadian Pacific	Canadian Pacific	Canadian Pacific
Whyte	4-4-0	4-4-0	4-4-0	4-4-0
Road Numbers	29-30			285
Gauge	Std	Std	Std	Std
Builder	Canadian Pacific	Canadian Pacific		Canadian Pacific
Year	1887	1887		1883
Valve Gear	Stephenson	Stephenson	Stephenson	Stephenson
	Locomotive Length and Weight
Driver Wheelbase	8.50'	8.75'	8.50'
Engine Wheelbase	22.96'	23.54'	22.96'
Ratio of driving wheelbase to overall engine wheebase	0.37	0.37	0.37
Overall Wheelbase (engine & tender)	47.93'	47.93'	47.93'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers	71000 lbs	66500 lbs	71000 lbs	56000 lbs
Engine Weight	115000 lbs	99000 lbs	115000 lbs
Tender Light Weight	105000 lbs		105000 lbs
Total Engine and Tender Weight	220000 lbs	204000 lbs	220000 lbs	0
Tender Water Capacity	4800 gals	3360 gals	4800 gals	2800 gals
Tender Fuel Capacity (oil/coal)	10 tons	11 tons	10 tons	10 tons
Minimum weight per yard of rail on which locomotive could run	59 lb rail	55 lb rail	59 lb rail	47 lb rail
	Geometry Relating to Tractive Effort
Driver Diameter	70"	69"	63"	62"
Boiler Pressure	160 psi	160 psi	160 psi	150 psi
Cylinders (dia x stroke)	17" x 24"	19" x 22"	17" x 24"	17" x 24"
Tractive Effort	13476 lbs	15654 lbs	14973 lbs	14264 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort)	5.27	4.25	4.74	3.93
	Heating Ability
Firebox Area	125 sq. ft	134.30 sq. ft	125 sq. ft
Grate Area	17.40 sq. ft	18.40 sq. ft	17.40 sq. ft	17.30 sq. ft
Evaporative Heating Surface	951	1369	951	1245
Superheating Surface	215		215
Combined Heating Surface	1166	1369	1166	1245
Evaporative Heating Surface/Cylinder Volume	150.83	189.63	150.83	197.46
	Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation	2784	2944	2784	2595
Same as above plus superheater percentage	3341	2944	3341	2595
Same as above but substitute firebox area for grate area	24000	21488	24000	0
Power L1	10395	5201	9355	0
Power MT	645.55	344.85	580.96	0