Ffestiniog 0-4-4 Locomotives in Great_Britain


Class Details by Steve Llanso of Sweat House Media

Class Taliesin (Locobase 6481)

Data from Scientific American Supplement No. 102 -- December 15,1877 as archived on [link] . Works number was 791 in 1876.

Vulcan's works #791 was a single Fairlie, which differed from the better-known double Fairlie in having a non-powered rear bogie. The single engine was a success in service. Its crews liked its soft ride and decent pulling power. According to the Scientific American, the Taliesin was rated at 40 tons up 1 in 80 (1 1/4%) at 14 mph. At the time daily mileage came to 85 miles or 3 round trips.

In 1900, the Festiniog fitted a new boiler and enlarged the cab and water tanks. By the mid 1920s the boiler needed replacement once again. When the board would not fund its replacement in 1924, the Taliesin at first was relegated to light duty, then retired altogether. It was gradually disassembled and the boiler scrapped in 1935.

Five decades later, Andy Savage and Gordon Rushton proposed building a Taliesin replica. It was a 10-year project conducted by 9-15 volunteers and described in entertaining detail in the December 2000 NSLME newsletter (look in [link]).

Principal Dimensions by Steve Llanso of Middle Run Media
ClassTaliesin
Locobase ID6481
RailroadFfestiniog
CountryGreat Britain
Whyte0-4-4T
Number in Class1
Road Numbers9
Gauge60 cm
Number Built1
BuilderVulcan Foundry
Year1876
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m) 4.50 / 1.37
Engine Wheelbase (ft / m)13.92 / 4.24
Ratio of driving wheelbase to overall engine wheelbase 0.32
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)22,400 / 10,160
Engine Weight (lbs / kg)33,600 / 15,241
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)33,600 / 15,241
Tender Water Capacity (gals / ML)450 / 1.70
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 0.50 / 0.50
Minimum weight of rail (calculated) (lb/yd / kg/m)19 / 9.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)32 / 813
Boiler Pressure (psi / kPa)150 / 1030
High Pressure Cylinders (dia x stroke) (in / mm)9" x 14" / 229x356 (4)
Tractive Effort (lbs / kg)9037 / 4099.12
Factor of Adhesion (Weight on Drivers/Tractive Effort) 2.48
Heating Ability
Tubes (number - dia) (in / mm)94 - 1.625" / 41
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)
Grate Area (sq ft / m2) 6.25 / 0.58
Evaporative Heating Surface (sq ft / m2)
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)
Evaporative Heating Surface/Cylinder Volume
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation938
Same as above plus superheater percentage938
Same as above but substitute firebox area for grate area
Power L1
Power MT

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