[Buttermilk]

http://www.steamploughclub.org.uk/history.html

There is even a club for it.

[Rupert the bear]

Thats it !!  2nd picture down that's the style of plough ,  good find there Buttermilk

[arobwk]

Steam plough club link provided a very interesting read.  Ta Buttermilk.   

[cloddopper]

Well, h&t88 and Rtb have proved me wrong, but no wonder the practice didn't last long - 2 steam engines and all that faff of moving each a couple of yards for the next run of furrows.  Did they actually turn the towed plough around for the "return" run (much like modern reversible ploughs) ??

 Dad  had a fair bit of experience of two steam engines dragging the special plough back & forth th fields .
 The idea was that you could use a ten furrow cut on the draw  , the heavy engines didn't compact the soil other than on the outer edges of the field.

 They became redundant when the likes of Marshal came along with the oil burning engine and a massive fly wheel aka POP POP Marshall. & the  Crawfords Crawler arrived that laid it's own ( road ) track on the field and had less than 3 lb a sq inch pressure under the track .