Question: Twelve FCM F1's were ordered in 1940 to replace a tank that was, in physical dimensions the largest what?

<P0-S0> The FCM F1 was a French super-heavy tank developed during the late Interbellum by the "Forges et Chantiers de la Méditerranée" company. <P0-S1>  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. <P0-S2>  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. <P0-S3>  The rear turret was higher so it could shoot over the first one. <P0-S4>  The vehicle was intended to be heavily armoured. <P0-S5>  Its size and protection level made it by 1940, at about 140 tons the heaviest tank ever to have actually been ordered for production. <P0-S6>  Despite two engines its speed would have been low. <P0-S7>  The primary purpose of the tank was to breach German fortification lines, not to fight enemy tanks. <P0-S8>  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. <P0-S9>  For each project in turn several companies submitted one or more competing proposals. <SEP> <P1-S0> The M22 Locust, officially Light Tank (Airborne), M22, was an American-designed airborne light tank which was produced during World War II. <P1-S1>  The Locust began development in 1941 after the British War Office requested that the American government design a purpose-built airborne light tank which could be transported by glider into battle to support British airborne forces. <P1-S2>  The War Office had originally selected the Light Tank Mark VII Tetrarch light tank for use by the airborne forces, but it had not been designed with that exact purpose in mind so the War Office believed that a purpose-built tank would be required to replace it. <P1-S3>  The United States Ordnance Department was asked to produce this replacement, which in turn selected Marmon-Herrington to design and build a prototype airborne tank in May 1941. <P1-S4>  The prototype was designated the Light Tank T9 (Airborne), and was designed so that it could be transported underneath a Douglas C-54 Skymaster transport aircraft, although its dimensions also allowed it to fit inside a General Aircraft Hamilcar glider. <SEP> <P2-S0> The "ARL tracteur C", or ARL Char C, was a French super-heavy tank developed during the late Interbellum by the "Atelier de Construction de Rueil" (ARL) company. <P2-S1>  A full-scale wooden mockup was halfly produced, but the project was terminated in favor of FCM F1, a directly competing design, which proved to be superior design. <P2-S2>  The vehicle was meant to be extremely heavy and for that time period, very heavily armored. <P2-S3>  ARL C was intended to be very long to fill up the requirement of having a long tank that could cross trenches up to 7 meters wide. <P2-S4>  The tank was multi-turretted like FCM F1; however, unlike FCM F1, ARL C had the main turret in front of the very long hull right behind the secondary turret, not in the back of vehicle. <P2-S5>  The development path of the ARL C 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. <P2-S6>  For each project in turn several companies submitted one or more competing proposals. <SEP> <P3-S0> The Char 2C, also known as the FCM 2C, is a French heavy tank, later also seen as a super-heavy tank, developed during World War I but not deployed until after the war. <P3-S1>  It was, in physical dimensions, the largest operational tank ever made.