Editing AMR 33 (section)

===Engin P===
On 9 January 1931, the French Artillery officially issued the specifications for a ''Type P'', which was to be a ''véhicule antichar'', a [[self-propelled gun|self-propelled antitank-gun]], that was to serve in the [[Maginot Line]] as a [[tank destroyer]]. On that date, Renault, who had been informed of the plans about a year earlier, had already begun to develop a prototype. The first plans foresaw a very small tracked vehicle, a ''chenillette'', weighing no more than 1.5 metric tonnes, on which a 25&nbsp;mm antitank-gun was to be mounted on a tripod in an open position. The gun would have to be removable, so that it also could be placed on the ground after having been transported by the vehicle.<ref>{{harvnb|Vauvillier|2005|p=34}}</ref>

However, the same year, it was decided to let the 25&nbsp;mm gun be towed by the Renault UE ''chenillette'', making the Type P redundant in its original scope. The Artillery therefore decided to mount, under armour, a much more powerful [[AC 37 anti-tank gun|37&nbsp;mm Modèle 1934 fortress gun]] with a [[muzzle velocity]] of 860&nbsp;m/s, which yet had to be developed by the ''Atelier de Puteaux'', the State armament arsenal.<ref>{{harvnb|Vauvillier|2005|p=34}}</ref>

In 1932, Renault delivered a prototype, a specially built chassis (N° 81805), that in general form resembled the standard AMR 33 but lacked a turret and had a raised hull roof. In the middle of the front of the superstructure, there was room for a gun; to the left of it, the driver was to be seated. Almost all available space was then occupied; this was solved by letting the gun loader sit on the floor, with his outstretched legs below the gun breech. In this cramped position, he was supposed to load the weapon, taking rounds with his right hand from a stock of 107 shells that had been positioned on the left back of the hull, where in the standard AMR 33 the back exit hatch was located. The third crew member, the commander, sat on the right, squeezed between the hull roof and the engine; he had hardly any headroom.<ref>{{harvnb|Vauvillier|2005|p=34}}</ref>

The Puteaux workshop only finished the prototype, now named the ''Engin P'', in the spring of 1935. After the gun was placed, the ''Engin P'' weighed 4565 kilogrammes and had a maximum speed of 54.1&nbsp;km/h. On 18 April 1935, the CEMAV (''Commission d'Expériences du Matériel Automobile de Vincennes''), after testing, expressed a very negative opinion: "An ancient and outdated model [...] incapable of rendering serious service". Moreover, on 24 June, the ''Conseil Consultatif de l'Armement'' decided that in future all guns up to a calibre of 47&nbsp;mm would have to be towed by the Renault UE after modifying the latter type (though this in fact never happened). As a result, the ''Engin P'' was rejected.<ref>{{harvnb|Vauvillier|2005|p=35}}</ref>