Mexican Railway 4-6-0 "Ten-Wheeler" Type Locomotives

Class 51 (Locobase 6739)

Data from MexRy 1939 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive collection.

This lone Ten-wheeler is shown with works number 43295, which confirms its 1907 build date. But it's a very small machine for standard gauge at that time. Locobase can only suppose that it was procured specifically to run on very light branch lines. Drury (1993) does not list this locomotive in his table of Mexican Railway engines.

Class F-1- 53 (Locobase 6956)

Data from FCM 1920 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive collection.

Relatively old Ten-wheeler with a long, straight boiler over unevenly spaced driving axles, firebox between the last two axles (which were 8 1/2 feet apart), steam dome over the front two driving axles (which were 5 feet apart), and straight stack. Note that 54 & 57 (at least) had tenders with 2,327 US-gallon oil capacity.

Class F-3- 21 (Locobase 6955)

Data from FCM 1920 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive collection.

Although the diagram is the only illustration available to Locobase, it seems to depict a Belpaire firebox. Although only three were left in 1920, the builder's numbers order suggests that at least 4682-4685 were produced as a batch for the Mexicano.

Class F-4 (Locobase 6734)

Data from MexRy 1939 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive collection.

Pittsburgh supplied the first 2 in 1900 and Dickson added 4 more in 1902.

Class F-5 (Locobase 6735)

Data from MexRy 1939 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive collection.

This pair of Ten-wheelers (works 28163-28164) followed a couple of earlier Baldwins. Although evaporative heating surface increased, the grate area dropped appreciably. This may not have mattered as much with oil-firing as it would have with coal, especially as the direct heating surface actually increased by 5 sq ft.

Class F-5 - 37 (Locobase 6736)

Data from MexRy 1939 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive collection.

This Ten-wheeler (works 24791, 24799) were similar to the Alcos that had preceded them onto the MR. The boiler was a bit bigger, but the other principal measurements differed little except for the driver diameter.

Specifications
Class	51	F-1- 53	F-3- 21	F-4	F-5	F-5 - 37
Locobase ID	6739	6956	6955	6734	6735	6736
Railroad	Mexican Railway	Mexican Railway	Mexican Railway	Mexican Railway	Mexican Railway	Mexican Railway
Whyte	4-6-0	4-6-0	4-6-0	4-6-0	4-6-0	4-6-0
Road Numbers	51	53-58	21-24	69-70 / 31-36	39-40	36-37
Gauge	Std	Std	Std	Std	Std	Std
Builder	Alco	Burnham, Parry, Williams & Co	Neilson & Co	several	Burnham, Williams & Co	Burnham, Williams & Co
Year	1907	1882	1894	1900	1906	1904
Valve Gear	Stephenson	Stephenson	Stephenson	Stephenson	Baker	Stephenson
	Locomotive Length and Weight
Driver Wheelbase	10.37'	13.50'	12.50'	12'	12.50'	12.50'
Engine Wheelbase	20.39'	23.52'	23.12'	23'	23.08'	23.08'
Ratio of driving wheelbase to overall engine wheebase	0.51	0.57	0.54	0.52	0.54	0.54
Overall Wheelbase (engine & tender)	49.62'	46.08'	50.21'	51.75'	48.33'	48.33'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers	79071 lbs	71905 lbs	106769 lbs	109257 lbs	115447 lbs	115352 lbs
Engine Weight	105138 lbs	91755 lbs	128219 lbs	137619 lbs	146107 lbs	146008 lbs
Tender Light Weight	82916 lbs	69268 lbs	99089 lbs	87486 lbs	87304 lbs	87302 lbs
Total Engine and Tender Weight	188054 lbs	161023 lbs	227308 lbs	225105 lbs	233411 lbs	233310 lbs
Tender Water Capacity	4500 gals	2600 gals	3500 gals	5000 gals	5000 gals	5000 gals
Tender Fuel Capacity (oil/coal)	2850 gals	2402 gals	2055 gals	2500 gals	2680 gals	2680 gals
Minimum weight per yard of rail on which locomotive could run	43.93 lb rail	39.95 lb rail	59.32 lb rail	60.70 lb rail	64.14 lb rail	64.08 lb rail
	Geometry Relating to Tractive Effort
Driver Diameter	56"	57"	60"	60"	54"	54"
Boiler Pressure	160 psi	150 psi	175 psi	175 psi	175 psi	170 psi
Cylinders (dia x stroke)	17" x 24"	18" x 24"	18.5" x 26"	20" x 26"	20" x 26"	20" x 26"
Tractive Effort	16845 lbs	17394 lbs	22061 lbs	25783 lbs	28648 lbs	27830 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort)	4.69	4.13	4.84	4.24	4.03	4.14
	Heating Ability
Firebox Area	145 sq. ft	125.60 sq. ft	123 sq. ft	164 sq. ft	172 sq. ft	167 sq. ft
Grate Area	22 sq. ft	17.76 sq. ft	24 sq. ft	32.50 sq. ft	33.20 sq. ft	33.20 sq. ft
Evaporative Heating Surface	1241	1215	1328	1817	2342	2023
Superheating Surface
Combined Heating Surface	1241	1215	1328	1817	2342	2023
Evaporative Heating Surface/Cylinder Volume	196.83	171.89	164.17	192.20	247.73	213.99
	Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation	3520	2664	4200	5687.50	5810	5644
Same as above plus superheater percentage	3520	2664	4200	5687.50	5810	5644
Same as above but substitute firebox area for grate area	23200	18840	21525	28700	30100	28390
Power L1	4656.45	3715.42	4203.57	4881.34	5334.48	4625.35
Power MT	389.49	341.75	260.39	295.49	305.61	265.20