Port Talbot Railway & Docks 0-6-0 Locomotives in Great_Britain

Class Details by Steve Llanso of Sweat House Media

Class Steam motor coach (Locobase 12312)

Data from T Hurry Riches and Sidney B Haslam, "Steam Motor-Car Traffic", Proceedings of the Institution of Mechanical Engineers, 1906, Parts 3-4 (October 1906), pp. 658-659, 664-666.

This was the largest steam motor coach to be built for British service and was designed by the Port Talbot's Locomotive Superintendent, A H Hertz.

Riches and Haslam noted the 6-coupled adhesive footprint and the 3-ft drivers and comment that the grade out of Port Talbot was "...extremely steep." -- a 3-mile stretch of 2 1/2% grade (1 in 40 ft). The rest of the 14-mile run to Pontyrhill had ruling grades of 1%, which of course the steam motor coach would have to scale in the other direction.

At the half-yearly meeting in 1906, Port Talbot's Colonel J R Wright claimed that the new steam rail motor coach had already given "satisfaction." It would "undoubtedly" lead to economy.

NB: Tube length is an estimate based on the calculation of tube surface area by subtracting reported firebox heating surface from reported total evaporative heating surface

Principal Dimensions by Steve Llanso of Sweat House Media

ClassSteam motor coach
Locobase ID12312
RailroadPort Talbot Railway & Docks
CountryGreat Britain
Number in Class1
Road Numbers
Number Built1
BuilderR W Hawthorne
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m) 9.50 / 2.90
Engine Wheelbase (ft / m) 9.50 / 2.90
Ratio of driving wheelbase to overall engine wheelbase1
Overall Wheelbase (engine & tender) (ft / m)50 / 15.24
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)
Engine Weight (lbs / kg)
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)600 / 2.27
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)36 / 914
Boiler Pressure (psi / kPa)170 / 11.70
High Pressure Cylinders (dia x stroke) (in / mm)12" x 16" / 305x406
Tractive Effort (lbs / kg)9248 / 4194.83
Factor of Adhesion (Weight on Drivers/Tractive Effort)
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)69 / 6.41
Grate Area (sq ft / m2)13.10 / 1.22
Evaporative Heating Surface (sq ft / m2)660 / 61.34
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)660 / 61.34
Evaporative Heating Surface/Cylinder Volume315.13
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2227
Same as above plus superheater percentage2227
Same as above but substitute firebox area for grate area11,730
Power L14894
Power MT

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