The famous prairie sod breakers and road builders started with the Twin City Forty in 1909. Working with McVicker engineering in Minneapolis five copies of this machine were made with a Minneapolis Steel & Machinery 7x10 engine, full canopy and operators cab.

The Forty was redesigned in 1910 by MS&MC to become the 40-65. Running at 500 RPM, the 7 1/4 x 9 engine was 1,486 ci. Weighing nearly 12 ton with one forward and one reverse gear, this second edition had no cab and the full length canopy was cut back materially in favor of fenders and a larger radiator

The smallest tractor in the heavyweight line was introduced in 1913 as a 15-30.
Two forward gears were used along with two different engines. Early production used a tube radiator with a horizontal cross-mount TD engine. Within a short time an inline 4 3/4 x 7 TF engine running at 650 RPM was used and late versions incorporated an automotive cellular type of radiator. Weight was nearly 4 ton.
Twin City 15-30, 1913 - 1917 TD & TF serial # 5001 to 5478.
Total production, 478 units.

The biggest Twin City of all carries some confusion with it’s ratings and production dates. It may have been introduced between 1913 and 1915 as a 60-95 or 60-110.
What is better known is that from 1916 to 1921 the 60-90 was produced. With one forward gear, a 7 1/4 x 9 six cylinder engine running at 500 rpm and a weight in excess of 14 ton, everything about this one hundred hp. Tractor was huge! 22 ft long, 10 ft wide and 10 ft tall, this giant machine cost over $6,000 when new.
Twin City 60-90, 1916-1921 serial # 1001 - 1820*
number of units is unknown. There are two original survivors today.

* The 40-65 and 60-90 are believed to fall under these same sets of serial numbers.