Sold April 2019 Back to Archive

2 inch scale Fowler Z7S ploughing engine - stock code 8482

A finely made Fowler Z7S compound superheated ploughing engine, it's come to us direct from the builder, a highly experienced engineer responsible for several good locomotives - one of which we sold a year or two ago - and other traction engines.

One of the largest engines built by Fowler, the Z7 was originally developed for overseas markets, where the type of ploughing undertaken in sugar plantations required a more powerful engine than hitherto produced. The Z7 appeared in the early years of the twentieth century, followed shortly thereafter by the superheated Z7S derivative, rated at 275ihp.

Starting from John Haining's excellent "Superba" design serialised in "Model Engineer" from 1988, the builder made several modifications to make the model closer to prototype, notably designing and casting a piston valve cylinder block. In a practical departure from full-size practice, a brake has been discretely fitted, operated by a wheel installed in the tender.

Built to a high standard throughout, the engine has been carefully used and well maintained throughout its life. The boiler, by Cheddar, has had recent test and remains in excellent condition. The Fowler smokebox superheaters - never a great success in the original engine - have been replaced in the model with four radiant superheaters which look capable of producing some highly energetic steam.

Paintwork is plainly finished, as per the prototype. The engine runs very well - there's a clip here of it ticking over outside the workshop following boiler test this morning.

Complete with drawings, along with builder's notes and blanking plates for testing the boiler.

length/inches 51
width/inches 19
height/inches 28
weight/kg 151
cylinder material cast iron
valve type piston
valve gear Firth radial
reverser type pole
lubricator type mechanical
injector(s) 1
boiler number CM0291
year built 1994
boiler maker Cheddar Boilers
CE mark n/a - pre-2002
working pressure/psi 100
boiler type locomotive
boiler material copper
boiler construction silver soldered
hydraulic test valid to 1-Apr-23
steam test valid to 2-Jun-20
superheater(s) 4
superheater type radiant
safety valve(s) 2
safety valve type Salter
mechanical pump 1