Given the size of the prototypes, most models of ploughing engines we see are built to 2 inch scale, built to the designs by John Haining and Colin Tyler published in "Model Engineer" magazine back in the 1960s and 70s. Even then, the larger types - including the BB1 and Z7 - are a heavy two man lift.
In 3 inch scale, the engine really becomes quite an imposing size. At nearly six feet long and around a third of a ton, there was no chance of lifting it - the engine took three of us just to push it up the ramps onto the trailer!
Unsteamed from new, the engine is largely complete bar a missing pressure gauge - the coiling gear, not shown in the photographs, is included. The boiler is welded steel with expanded tubes, most of which leak at the front tube plate.
Jobs requiring attention include:
Not a five minute job, but a worthwhile project - rare in this scale we've only ever had one other 3 inch BB1which sold back in 2014 - there are some picture of that one in the archive here.
|axlebox type||plain bearing|
|cylinder material||cast iron|
|boiler construction||welded, expanded tubes|
|safety valve type||Ramsbottom|