5AT Advanced Technology Steam Locomotive

5AT
The 5AT locomotive illustrated in its final form.
Type and origin Power type Steam Designer David Wardale
Specifications Configuration: ​  • Whyte 4-6-0 Gauge 4 ft 8+1⁄2 in (1,435 mm) Leading dia. 3 ft 0 in (0.914 m) Driver dia. 6 ft 2 in (1.880 m) Axle load 20 tonne Adhesive weight 60 tonne Loco weight 80 long tons 0 cwt (179,200 lb or 81.3 t) Total weight 160 long tons 0 cwt (358,400 lb or 162.6 t) Fuel type Light Oil or Coal Fuel capacity 7 long tons 0 cwt (15,700 lb or 7.1 t) Water cap. 10,000 imperial gallons (45,000 L; 12,000 US gal) Boiler pressure 305 psi (2.10 MPa) Cylinders Two Cylinder size 17.72 in × 31.5 in (450 mm × 800 mm) Loco brake Air Train brakes Air
Performance figures Maximum speed 113 mph (Max Design Speed 125 mph) Tractive effort 32,688 lbf (145.40 kN) Factor of adh. 4 approx

The 5AT Advanced Technology steam locomotive was a conceptual design conceived by the British engineer David Wardale,^[1] and first described in his 1998 definitive work on modern steam, The Red Devil and Other Tales from the Age of Steam.^[2]

Wardale's purpose in putting forward the "Super Class 5 4-6-0" design concept (as he then called it) was to offer a future for steam hauled trains on the main lines in the UK on which the use of heritage traction is likely to be gradually phased out as the speed and density of commercial rail traffic increase.^[3]

Work on the project was suspended in March 2012 following completion of a project Feasibility Study and subsequent failure to raise the finance needed to complete the detail design and construction of the locomotive.^[4]