FCM F1

The FCM F1 was a French super-heavy tank developed during the Interwar period by the Forges et Chantiers de la Méditerranée company. Twelve were ordered in 1940 to replace the Char 2C, but France was defeated before construction could begin, a wooden mock-up being all that was finished. 

The FCM F1 was large and elongated, and had two turrets: one in front and one in the back, with a single high-velocity gun in each turret. The rear turret was higher so it could shoot over the first one. 
                         
The vehicle was intended to be heavily armored. Its size and protection level made it early 1940 with about 140 tons, the heaviest tank actually ordered. Despite two engines its speed would have been slow. 
                                         
The primary purpose of the tank was to breach German fortification lines, not to fight enemy tanks. The development path of the FCM F1 was extremely complex, due to the existence of a number of parallel super-heavy tank projects with overlapping design goals, the specifications of which were regularly changed. For each project again several companies submitted one or more competing

After the Fall of France all official design on heavy/super-heavy tanks was halted. The Char F1 showed quite a few similarities though to the ARL 44, produced just after the war. In 1944 the Allies had developed some new vehicles with exactly the same purpose as the FCM F1: to breach the "Siegfried Line". The British had the Tortoise heavy assault tank, the Americans the Super Heavy Tank T28. Both designs were self-propelled guns however, not multi-turreted tanks, allowing them to be lighter and still better protected. Like the FCM F1 they would not be placed into production.

FCM F1
Type	Super-heavy tank
Place of origin	France
Specifications
Weight	139 metric tons
Length	10.53 m
Width	3.10 m
Height	4.21 m
Crew	9
Armour	100 mm
Main armament	90 mm DCA gun
Secondary armament	47mm SA37 gun and six machine guns
Engine	two Renault V12 KGM of 550 hp 1100 hp total
Power/weight	7.9 hp/t
Suspension	vertical coil springs
Operational range	200 km
Speed	20 km/h