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3 inch scale Burrell agricultural engine - stock code 9617

A 3 inch scale Burrell 6nhp agricultural engine, in most respects to the Plastow design although the builder went somewhat off-piste with the boiler.

The work of an experienced model engineer, although this was the only traction engine he built, his other models being locomotives. On his demise the whole collection was left in a shed under less than ideal conditions; damp has taken its toll, much of the brightwork is covered in a light coating of surface rust - not yet deeply pitted, most could be removed with Scotchbrite.

In the main the engine has been well made - despite appearances it turns over very smoothly and runs on air in both directions. Machining is well done, fit of the motionwork and valve gear good.

Not quite sure what the builder had in mind when it got to the boiler, but it was certainly something different to what Mr Plastow envisaged. Flanged and rivetted, with pressurised hornplates and expanded tubes - at first glance one might imagine the work of somebody trying to produce something closer to prototype practice.

However, it has a small number of large diameter flue tubes, into which have been fitted sheet metal "feathers" to effectively split the tube in half down the middle in an effort, we suspect, to increase gas velocity.

Fabricated from a veritable pot-pourri of materials and jointing techniques, construction features copper, steel, stainless steel, welding and calked nuts in the firebox. Enough to make any boiler inspector run a mile...

scale 3 inch
length/inches 45
width/inches 20
height/inches 29
cylinder material cast iron
valve type slide
valve gear Stephensons
reverser type pole
lubricator type mechanical
injector(s) 1
working pressure/psi 100
boiler type locomotive
safety valve(s) 2
safety valve type Ramsbottom
mechanical pump 1
whistle yes
road speed(s) 2