For tractor-trailers, it'll be either the 12 liter ISX12 or the 14.9 liter ISX15.
That really depends on which model you're talking about, and the application. Cummins manufactures a wide range of diesel engines for on-road, off-highway, and marine usage.
You can not drive farm tractors on the road for very long. They are too slow. You would have to get off the road when there is traffic.
With proper lighting, yes.
Tractors are allowed to travel on all UK roads EXCEPT motorways, and can be driven by 16 year olds.
Excellent traction on off road conditions.
Aside from being illegal, off-road diesel will plug your DPF.
Stewart & Stevenson work on tractors. Call them at 1631 Chalk Hill Road, Dallas, TX‎ - (214) 631-5370‎
Different strokes for different folks. The Detroit Diesel 60 series is great for over-the-road applications. The Cummins ISX fares better in heavy haul applications and anything which involves going off-road.
For warmth, to generate electricity, to run furnaces and steam trains/road tractors etc.
Ford stopped road tractor production in the 70's so knowing that i would say that they dont currently make tractors available to the public.
The first engine-powered farm tractors used steam and were introduced in 1868. These engines were built as small road locomotives and were operated by one man if the engine weighed less than 5 tons. They were used for general road haulage and in particular by the timber trade. The most popular steam tractor was the Garrett 4CD.
Assuming you're referring to a road tractor, over $100,000 for a new one.