I've been trying to find the lyrics to this song in the dt without any success, probably because I don't know the title.
The chorus (as near as I remember it) is:

Now the harness and horse-collars gather dust upon the wall,
There's no work now for the ploughboy or his team,
There's rust upon the ploughshare, empty echoes in the stalls,
Now the ploughing's done by contract and with steam.