Three hundred horsepower to pull a trailer? That sounds excessive, but it is one of the roles envisaged for a new breed of powerful tractors that makers say are not so big as to be confined to field ...

Versatile also has plans to add a handful of smaller, multi-purpose tractors starting at 170hp. These will have a 6.7-litre Cummins six-cylinder engine and the option of a stepless or powershift ...