Most tractors of the same brand working simultaneously

According to Official Guinness Records,

A total of 726 Ferguson tractors tilled the soil together at the Grianan Estate, Burt, Donegal, Ireland, on 20 September, 2014. The event was organised by The White Cross Vintage Association (Ireland). Tractors from Ireland, England, Scotland and the Netherlands came together to work the soil of the Grianan Estate.

For a complete list of 2014 records, please visit 2014 Guinness Records in Ireland.

Other Ireland records that might interest you:

• Longest snooker marathon, singles
• Heaviest deadlift in one hour (male)
• Fastest marathon in a fireman's uniform
• Largest wellington boot race
• Longest awareness ribbon chain