This page is intended to give an overview of Gertrude’s technical specifications for other railways as well as enthusiasts and modellers.

Built: 1918
Rebuilt: 2009 (boiler ticket from 08/2009)
Builder: Andrew Barclay, Kilmarnock, Scotland (Works no.1578)
Wheel Arrangement: 0-6-0T
Gauge: 1 ft 11 5/8 in – 600 mm (NB, re-gauged from 610 mm)
Back-to-Back: 21.25 in – 539.75 mm
Valve Gear: Stephenson
Braking: Steam Air Pump (TR) & Twin Line Air Brakes (train air brake also works loco brake blocks)
Cylinder Diameter: 7 in – 178 mm
Cylinder Stroke: 14 in – 356 mm
Wheel Diameter: 26 in – 660 mm
Total wheelbase (lead to trailing axle): 6 ft 3 in – 1905 mm
Centre Driving Wheel Float: 0.375 in – 9.5 mm
Overall Height (from rail head): 8 ft 11.5 in – 2730 mm
Cab Height (from rail head): 8 ft 9.5 in – 2680 mm
Maximum Width: 6 ft – 1829 mm
Overall Length (excluding couplings): 14 ft 1.5 in – 4305 mm (fixed couplings, add 250 mm)
Maximum Working Pressure: 160 lbf/in2 – 11 bar
Heating Surface (Tubes): 107.6 sqft – 10 sqm
Heating Surface (Firebox): 16 sqft – 1.5 sqm
Heating Surface (Total): 123.6 sqft – 11.5 sqm
Grate Area: 4 sqft – 0.37 sqm
Tank Capacity: 954 L – 210 UK gal
Fuel Space: 19.8 cu ft – 0.56 cu mtrs
Weight Empty: 8.5 tons – 8636kg
Weight in Working Order: 10 tons – 10160kg
Tractive Effort: 20.3 kN – 4573 lbs (unconfirmed)
Max. Tractive Effort at 75% Pressure 160 lbf/in2:
Constant Tractive Effort at 75% Pressure 120 lbf/in2:
Power to Weight Ratio:
Min. Horizontal Curve Radius Negotiable: 1:4
Max. Trailing Load on Level Track: (so far tested with 62 tons, no problem)
Max. Trailing Load up a 1:100 Gradient:
Max. Trailing Load up a 1:50 Gradient:

Gertrude's connecting rod up close...

Gertrude's connecting rod up close...