I shot a bit of video while I was in Stradbally, so hopefully this will keep you going.
It's a ploughing engine – a Fowler, I think. You can tell it's a ploughing engine by the big winch drum mounted under the boiler.
Because of the weight and steel tires, using the engine to tow a plough would have caused too much damage to the ground. So they used two engines, one at either end of the field and winched a steerable plough back and forth between them.