
Anyway, you're not supposed to cut the railway line because as you noted, the AI will restore supply. Just put three partisans between the river tile next to the Hungarian infantry and the end of the map. Novgorod can not be reached by supply from the east and will be cut off for the rest of the scenario.
Regarding the tanks, I tried it now and there is no problem taking them both out on turn one. Soften them up with your T34-infantry and regular infantry and then finish them off without taking casualties with your tanks and veteran infantry. Preferably, don't keep your 5-step tanks left on the front line at the end of turn one. Giving them the free artillery and towed AT will be helpful in fighting of attacks from German infantry on later turns but won't help you on turn one.
Use the logistics to increase the range of the southern supply center and work your way forward. Yes you will have to be out of supply on turn 6 but as you know you can still attack if it's the first turn out of supply, so make sure you are in supply at the start of turn 5. I've found coming at Novgorod from the north is the easiest, so start moving northwest when you reach the railway line north to Briansk. Try to send the cavalry unit or some infantry to cut off Briansk if possible.
Btw Daniel, since you haven't bothered with a thread for Nordlicht. Nice work once again!

EDIT: It seems Daniel was faster than me and after looking at his replay I'd say that increasing the north-eastern supply probably is better, but cut Novgorod off as soon as possible the way i described.