Soviet Mechanised Corps
Corps HQ:
Comd in Gaz Jeep with 0-1 NKVD (C1-2)
Signals staff car (C3)
Corps Recce Bn:
Comd M/C (R3)
0-1 A/C (R3) – (A/Cs were rarely present)
Tank Brigade:
Comd T-34 (C3)
2-4 T-34 (F3)
1-2 T-26 or T-34 (F3) a maximum of 6 models in total but often 2 Lt. 3 Med,
0-6 SMG tank rider bases making up 0-2 Stands (@F3)
Motor Rifle Bde x 2-3:
Bde comd + [82mm mortar or medium machine gun (MMG)] + anti-tank rifle (ATR) (CS3),
3 rifle bases (F3) *
The picture above shows a normal strength 5 base battalion. The Comd has transferred to the fighting stand designating it as C3 or CF3
Artillery Regiment:
RHQ comd (C3)
FOO (O1)
76mm divisional gun (S3)
+ limber (L3)

Divisional Artillery Regiment equipped with 76mm Divisional guns. Peter Pig and converted Airfix Universal Carrier
Self-propelled Artillery Regiment:
0-1 SU-76 or SU-85 or SU152 (S3) [From army]
Mortar Regiment:
RHQ comd(C1)
FOO(O1)
120mm mortar (S3)
+ limber (L3)
Anti-tank Regiment:
45mm Gun (S3)
Limber (L3)
0-1 ATR (S1)
Pioneer Battalion:
2 Pioneer bases (@E1-2),
1-2 Trucks (L3)
0-1 Bridging Trailer (L3)

Pioneer Battalion. Peter Pig figures from his WW1 range with a scratch built truck and 1/72 Airfix trailer
The Soviets varied their mechanised corps to cope with the gap between what they wanted and what they had. The list above was amended in December 2011 to reflect a composite orbat dated mid to late 1942. See Zaloga and Ness (1998) Red Army Handbook 1936-1945 for the detail of the ins and outs, a summary of which is reproduced here for the 1943 onwards period:
1943 onwards, 1944 onwards, 1945 onwards.
Mechanised Corps HQ.
Command car (C3), Signal Van (C3), T-34 (C3).
Tank Brigade.
T-70 (C2), 5 T-34 (F3), 0 T-70, 6 T-34 (F3).
Motor Rifle Brigade x 3 ( infantry component is unchanged as above)*.
3 82mm mortar (S3)
2 120mm mortar (S3)
45mm Atk gun (S3)
This is a total for all 3 brigades and the infantry component is not shown. Probably no more than one of the brigades would be motorised, the other two marching or travelling on the back of tanks.
Artillery Regiment.
76mm gun (S3), Su-76/85 (S2), SU-152 (S2)
37mm AA (S3) then shown at army level after 1943,
Katyusha, SU-152, are shown at army, or artillery division level.