Yes, The Edge, you are right!
Just one note - not T-III, but T-111
Soviet experimental medium tank T-46-5 (T-111) was the first Soviet tank with the cannonproof armor. It was bullt in Leningrad (plant No.185) in spring 1938 and was tested till April 1939. Engine was located in the rear, but transmission at the front. Armor of T-46-5 could protect it from 37mm armor-piercing shells from all distances and from 76mm armor-piercing shells from 1200 m. Tank was equipped with the radio station 71-TK-1 with the raising antenna.
Photo above ( from
http://www.bratishka.ru/templates/im/20 ... 080716.jpg ) shows T-46-5 during ground tests in spring 1939 (Kubinka tank training area, Moscow region)
One additional photo of T-46-5 (Kubinka, 1939) -
http://www.arrows.newmail.ru/gallery.files/t46.gif
The Edge wrote:
Prototype utilising Christie suspension with small road wheels, armour to 60 mm, 45 mm gun, 28 tons, crew 4, 300 HP diesel engine, 28 mph.
Its weight was not 28 t, but 32.3 t. Crew 3 men, not 4. Armament - 45mm gun (121 shells) + 3x7.62mm MGs DT (2394 rounds): coaxial, rear in the turret and removable AA. Engine was not diesel but gasoline, 320 hp MT-5-1. Armor was really 20-60mm. Speed - 31 km/h. Range 126 km (492 l of fuel).
As for the Christie suspension - Davide is right. T-46-5 had the suspension not of Christie-type, of course. Soviets built also experimental light wheel-track tank T-46 with 8 big road wheels of Christie-type (
http://ww2photo.mimerswell.com/tanks/su ... /06033.jpg ), but that T-46 had nothing common with the medium T-46-5.
It was planned to use T-46-5 during the Winter War as Finnish AT guns couldn't penetrate its armor. T-46-5 was reequipped with diesel V-2 (500 hp), but its engine renovation took some time and Winter War came to end.
T-46-5 had excellent armor for the end of 1930s, but insufficient armament (as light tanks) and quite low speed. Soviet Army needed not only in modern infantry tanks but also in good cruise tanks, and new models should be used in both roles. So the serial production of T-46-5 was rejected.
Best regards, BIGpanzer