Data from Wiener (1930); and "Kenya-Uganda Railway-Design 1112", Beyer-Garrrat Patent Articulated Locomotives (Manchester, England: Beyer-Peacock & Company Limited, 1931), archived on flickr's Historical Railway Images at [], et seq, pp. 25-26. Works numbers were 6300-6303 in 1926. Later batches included 45-56 (works numbers 6429-6440), 57-64 (6516-6523), which came in 1928, and 65-66 (6637-6638) delivered in 1930.
This pioneer group of East African Mountain Garratts set the standard for KUR metre-gauge Garratt power. B-P proudly offered them as a "perfect practical example of the all-round advantages" gained by adopting this type ...[such as] a capacity of a narrow gauge line can be virtually doubled without capital expenditure on the existing rail and permanent way conditions."
Expansion of the KUR doubled itx route mileage and upgrades put 80 lb/yard (40 kg/metre) rail between Mombasa on the Red Sea and Nairobi, over which EC1s hauled passenger trains. Much of the system still used 50 lb/yard (25 kg/metre) rail and uncompensated 2% grades, over which a conventional eight-coupled superheated engine could haul 30 units totalling 200 tons. EC1s "enabled a load of 440 tons."
"Many of the locomotives are operated by African native drivers," B-P's 1931 guide stated, "and excellent mileage and service has been obtained from them."
EC1s; in East African Railways service they were grouped as Class 50 or Class 51 (65-66). They had larger tenders (6,300 US gallons or 23,846 litres), and an higher all-up weight of 291,200 lb (132,086 kg).
Data from Gavin Hamilton's excellent compilation of Garratt data posted at []
(6 September 2005)-later relocated to []; and "KUR EC2 class" in Wikipedia at [], last accessed 2 September 2021and A[rthur] E[dward] Durrant, Garratt Locomotives of the World (revised edition) (Newton Abbott, UK: David & Charles, 1981), p. 179-180. Works numbers were 24070-24079 in 1931.
Durrant describes the procurement of this class of Double Mountain Garratts (which he described as "cuckoo-like interlopers") as "something of a mystery." Built by NBLC in Glasgow, the engines never appeared in that firm's advertisements although a pamphlet described them as "North British Articulated Locomotives." Judging that these were "Garratts pure and simple" and speculated that Beyer, Peacock's attorneys acquainted North British with their firm opinion that these engines violated patents originally awarded in 1909. As far as is known, North British didn't attempt to sell this design to any other prospects.
Names were:
67 5201 Busoga
68 5202 Kavirondo
69 5203 Mubendi
70 5204 Turkhana
71 5205 Nyeri
72 5206 Kiambu
73 5207 Nzoia
74 5208 Isiolo
75 5209 Nakuru
76 5210 Entebbe
Data from Editorial Note from "The Railway Gazette" July 21, 1939, reprinted by permission on [] (visited 24 October 2003). Additional information from "4-8-4+4-8-4 Metre-gauge Beyer-Garratt Locomotives for the Kenya-Uganda Railways", reprinted from 21 July 1939 Railway Gazette (Manchester: Beyer, Peacock & Co, Ltd.), archived at [], last accessed 23 September 2011; and "'57' Class Locomotive" East African Railways and Harbours Magazine, Volume 2, No. 1 (February 1955), p. 22. Works numbers were 6905-6910 in 1939, 6970-6975 in 1940.
Double Northern Garratts that spread the weight over an unprecedented number of axles in order to provide as much tractive power as possible on 50-lb/yard (25-kg/metre) rail.
The Belpaire firebox included two arch tubes and two Nicholson thermic syphons. Each piston valve measured 9" (179 mm) in diameter. Because the leading driver in each set was flangeless, the rigid wheelbase for each was 10 ft (3.05 m).
These were later grouped as Class 57 in the East African Railways classification. Names were:
77 5701 Mengo
78 5702 Teso
79 5703 Uasingishu
80 5704 Narok
81 5705 Marakwet
82 5706 Wajir
83 5707 Chua
84 5708 Gulu
85 5709 Lango
86 5710 Budama
87 5711 Karamoja
88 5712 Kigezi
NB: Tube length is between sheets.
Data from Gavin Hamilton's excellent compilation of Garratt data posted at [] (6 September 2005); and "56' class", East African Railways and Harbours Magazine, Volume 3, No 10 (December 1954), p. 344. Works numbers were 7280-7285 in 1949.
These Double Mountain Garratts were ordered for service on the Burma Railway. But the EAR&H, then known as the Tanganyika Railway, noted that they were "offered for sale as excess to requirements." The EAR bought the engines "to relieve the hard pressed motive power resources prevailing." Dubbed Class 56 when incorporated into the East African Railways..
Built with two fuel and water bunker sizes. The larger had 5,400 US gallons of water and boosted the engine weight to 322,560 lb. The Belpaire firebox's heating surface area included arch tubes. Locobase's specification reflects the later use of oil fuel.
Principal Dimensions by Steve Llanso of Middle Run Media | ||||
---|---|---|---|---|
Class | EC/50 or EC1/51 | EC/52 | EC3/57 | EC6/56 |
Locobase ID | 695 | 696 | 697 | 694 |
Railroad | Kenya-Uganda Railway | Kenya-Uganda Railway | Kenya-Uganda Railway | Kenya Uganda Railway |
Country | Kenya | Kenya | Kenya | Kenya |
Whyte | 4-8-2+2-8-4 | 4-8-2+2-8-4 | 4-8-4+4-8-4 | 4-8-2+2-8-4 |
Number in Class | 26 | 10 | 12 | 6 |
Road Numbers | 41-44 | 67-76 | 77-88 | 122-127 |
Gauge | Metre | Metre | Metre | Metre |
Number Built | 26 | 10 | 12 | 6 |
Builder | Beyer, Peacock | North British | Beyer, Peacock | Beyer, Peacock |
Year | 1926 | 1931 | 1939 | 1949 |
Valve Gear | Walschaert | Walschaert | Walschaert | Walschaert |
Locomotive Length and Weight | ||||
Driver Wheelbase (ft / m) | 24.50 / 7.47 | 30 / 9.14 | 26.75 / 8.15 | |
Engine Wheelbase (ft / m) | 49.67 / 15.14 | 70.42 / 21.46 | 79.08 / 24.10 | |
Ratio of driving wheelbase to overall engine wheelbase | 0.49 | 0.43 | 0.34 | |
Overall Wheelbase (engine & tender) (ft / m) | 72 / 21.95 | 87.92 / 26.80 | 79.08 / 24.10 | |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | 23,520 / 10,669 | 26,880 / 12,193 | 24,640 / 11,177 | 23,968 / 10,872 |
Weight on Drivers (lbs / kg) | 177,744 / 80,623 | 199,136 / 90,327 | 197,120 / 89,412 | 197,120 / 89,412 |
Engine Weight (lbs / kg) | 280,784 / 127,362 | 309,456 / 140,367 | 328,720 / 149,105 | 298,560 / 135,425 |
Tender Loaded Weight (lbs / kg) | ||||
Total Engine and Tender Weight (lbs / kg) | 280,784 / 127,362 | 309,456 / 140,367 | 328,720 / 149,105 | 298,560 / 135,425 |
Tender Water Capacity (gals / ML) | 5100 / 19.32 | 6300 / 23.86 | 7200 / 27.27 | 5040 / 19.09 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 6.60 / 6 | 14.40 / 13.10 | 2850 / 2590.90 | |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 37 / 18.50 | 41 / 20.50 | 41 / 20.50 | 41 / 20.50 |
Geometry Relating to Tractive Effort | ||||
Driver Diameter (in / mm) | 43 / 1092 | 43 / 1092 | 54 / 1372 | 48 / 1219 |
Boiler Pressure (psi / kPa) | 170 / 1170 | 170 / 1170 | 220 / 1520 | 200 / 1380 |
High Pressure Cylinders (dia x stroke) (in / mm) | 16.5" x 22" / 419x559 (4) | 16.5" x 22" / 419x559 (4) | 16" x 26" / 406x660 (4) | 16" x 24" / 406x610 (4) |
Tractive Effort (lbs / kg) | 40,255 / 18259.38 | 40,255 / 18259.38 | 46,099 / 20910.18 | 43,520 / 19740.36 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.42 | 4.95 | 4.28 | 4.53 |
Heating Ability | ||||
Tubes (number - dia) (in / mm) | 218 - 1.875" / 48 | 220 - 1.875" / 48 | 180 - 2" / 51 | |
Flues (number - dia) (in / mm) | 32 - 5.25" / 133 | 38 - 5.25" / 133 | 32 - 5.25" / 133 | |
Flue/Tube length (ft / m) | 12.43 / 3.79 | 12.95 / 3.95 | ||
Firebox Area (sq ft / m2) | 174 / 16.16 | 174 / 16.17 | 251 / 23.32 | 163 / 15.14 |
Grate Area (sq ft / m2) | 43.60 / 4.05 | 44 / 4.09 | 48.50 / 4.51 | 48.75 / 4.53 |
Evaporative Heating Surface (sq ft / m2) | 2037 / 189.24 | 2037 / 189.31 | 2266 / 210.52 | 1976 / 183.58 |
Superheating Surface (sq ft / m2) | 380 / 35.30 | 380 / 35.32 | 484 / 44.96 | 399 / 37.07 |
Combined Heating Surface (sq ft / m2) | 2417 / 224.54 | 2417 / 224.63 | 2750 / 255.48 | 2375 / 220.65 |
Evaporative Heating Surface/Cylinder Volume | 187.07 | 187.07 | 187.26 | 176.90 |
Computations Relating to Power Output (More Information) | ||||
Robert LeMassena's Power Computation | 7412 | 7480 | 10,670 | 9750 |
Same as above plus superheater percentage | 8598 | 8677 | 12,591 | 11,408 |
Same as above but substitute firebox area for grate area | 34,313 | 34,313 | 65,160 | 38,142 |
Power L1 | 7079 | 7079 | 12,889 | 9142 |
Power MT | 702.43 | 626.97 | 1153.22 | 817.96 |