Pz I в реальности и игре

Taranov: "A general specification was laid down and as a first step towards design the committee obtained a Holt tractor from Austria: this American-designed caterpillar tractor (built under licence in Budapest) was at that time the only suitable tracklaying vehicle available to Germany for experiment. It is interesting to note here that the Holt had also inspired Colonel Swinton's landship proposals put before the War Office in Britain and also formed the basis for the French heavy tanks.
After trials of the Holt tractor, a lengthened version of the chassis was designed by Josef Vollmer, powered by two Daimler engines of 100 h.p. each (the original proposals for one 80-100-h.p. engine being recognized as inadequate) and, fitted with a wooden mock­up of an armoured hull, was first demonstrated in the Spring of 1917­. "
http://www.landships.freeservers.com/emhar_a7v.htm