Data from "Dinorwic Alice Class" in Wikipedia at [], last accessed 2 December 2021. See also Mark Adlington originally at pws.prserv.net/mdsme/Hunslet/Alice_class.htm,, later [
], last accessed 2 Decmber 2021.
Wikipedia lists the following works numbers for this class: 409 in 1886, 492-493 in 1889, 541-542 in 1892, 680 in 1898, 779-780 in 1902, 822-823 in 1903, and 849 in 1904.
Mark Adlington in the Quarry Engines of North Wales website shows this as a separate class from the Penrhyn Small Quarry locomotives, but they are essentially identical. As delivered to the Dinworic Quarry, they were named Velinheli, Alice, Enid, No.1, No.2, Wellington, No.3, No.4, No.5, No.6, No.7. Excepting Velinheli, their "second names" were King Of The Scarlets, Red Damsel / Elidir, Rough Pup, Cloister, George B, Holy War, Alice, Maid Marian, Irish Mail, Wild Aster / Thomas Bach.
Wikipedia explains that the Alices were the product of Dinworic Quarry's quest for more powerful locomotives to operated on double-headed, chaired rails. The first engine of the matured design, Velinheli, actually worked for Port Dinorwic (or Y Felinheli), and immediately satisfied the requirement. Dinworic would buy Alice and nine more over the next sixteen years. As delivered, the Alices didn't have any footplate protection; several of the heritage engines have been fitted with full cabs. A small saddle tank lay on the boiler between the safety valve stand over the firebox and the tall, thin chimney over the smokebox.
Every engine in the class was preserved, in some cases heavily restored or retained for parts, for heritage railways. Bala Lake Railway is shown as having the most (4), Llanberis Lake (2)
Mark Adlington in the Quarry Engines of North Wales website -- pws.prserv.net/mdsme/Hunslet/Mills_Tramroad_class.htm -- shows illustrations of the two surviving quarry locomotives of this Hunslet class. See also "The Padarn Railway", The Locomotive Magazine, Vol XI (16th January 1905), p. 13 and [], the Narrow-Gauge Railway Museum's website.
Both were originally owned by the Dinorwic company, having been bought in 1895 as Port Dinworic (Jerry M, works # 638) and 1898 as Vaenol (Cackler, works # 671).
Gavin Hamilton shows the Cilgwyn Quarries "Lillla" (1891, works #554) which appears to be identical.
Principal Dimensions by Steve Llanso of Middle Run Media | ||
---|---|---|
Class | Alice | Mills/Tramroad |
Locobase ID | 5983 | 5982 |
Railroad | Dinorwic Quarries | Dinorwic Quarries |
Country | Great Britain | Great Britain |
Whyte | 0-4-0ST | 0-4-0ST |
Number in Class | 11 | 2 |
Road Numbers | ||
Gauge | 60 cm | 60 cm |
Number Built | 11 | 2 |
Builder | Hunslet Engine Co | Hunslet Engine Co |
Year | 1886 | 1895 |
Valve Gear | ||
Locomotive Length and Weight | ||
Driver Wheelbase (ft / m) | 3.25 / 0.99 | 4.49 / 1.37 |
Engine Wheelbase (ft / m) | 3.25 / 0.99 | 4.49 / 1.37 |
Ratio of driving wheelbase to overall engine wheelbase | 1 | 1 |
Overall Wheelbase (engine & tender) (ft / m) | ||
Axle Loading (Maximum Weight per Axle) (lbs / kg) | ||
Weight on Drivers (lbs / kg) | 13,440 / 6096 | 26,321 / 11,939 |
Engine Weight (lbs / kg) | 13,440 / 6096 | 26,321 / 11,939 |
Tender Loaded Weight (lbs / kg) | ||
Total Engine and Tender Weight (lbs / kg) | ||
Tender Water Capacity (gals / ML) | 120 / 0.45 | 264 / 1 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 0.08 / 0.10 | 0.20 |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 11 / 5.50 | 22 / 11 |
Geometry Relating to Tractive Effort | ||
Driver Diameter (in / mm) | 20 / 508 | 26 / 660 |
Boiler Pressure (psi / kPa) | 140 / 970 | 140.70 / 970 |
High Pressure Cylinders (dia x stroke) (in / mm) | 7" x 10" / 178x254 | 8.5" x 14" / 216x356 |
Tractive Effort (lbs / kg) | 2916 / 1322.68 | 4653 / 2110.57 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.61 | 5.66 |
Heating Ability | ||
Tubes (number - dia) (in / mm) | 45 - 1.732" / 44 | |
Flues (number - dia) (in / mm) | ||
Flue/Tube length (ft / m) | ||
Firebox Area (sq ft / m2) | 14 / 1.30 | 21.95 / 2.04 |
Grate Area (sq ft / m2) | 2.50 / 0.23 | 3.55 / 0.33 |
Evaporative Heating Surface (sq ft / m2) | 100 / 9.29 | 193 / 17.94 |
Superheating Surface (sq ft / m2) | ||
Combined Heating Surface (sq ft / m2) | 100 / 9.29 | 193 / 17.94 |
Evaporative Heating Surface/Cylinder Volume | 224.51 | 209.90 |
Computations Relating to Power Output (More Information) | ||
Robert LeMassena's Power Computation | 350 | 499 |
Same as above plus superheater percentage | 350 | 499 |
Same as above but substitute firebox area for grate area | 1960 | 3088 |
Power L1 | 1781 | 2008 |
Power MT | 584.29 | 336.38 |