This game will have a slightly different economic system than the other games we have had in the past. On such wide open expanses, Supplies became crucial, and as such, Supply lines will be a deciding factor in how battles are fought. Each faction has supply lines originating from their Capital(Berlin and Moscow); However, for the Germans, they also have a smaller depot in Finland for supplying their Finnish allies, while the Soviets have two Depots in the Crimea for supplying their two besieged garrisons there.
The main currency in this game will be Supply Points. Each province, no matter how industrialized or rural it may be, provides the same amount of manpower for their factions. For each province they control, Germany will gain 3 supply points; likewise, the Soviets will gain 10 supply points for each province they control. This represents the disdain of the Western Soviet peoples to work with the Nazis and, once the Soviets reach Germany, the sheer lack of manpower the Germans have to oppose them.
The Germans, by my count, have 1,120 provinces. This gives them 3,360 supply points to spend each turn.
The Soviets have 289 provinces, again by my count. This gives them 2,890 supply points to spend each turn.
In addition, the German and Soviet supply lines have a number of "Supply Depots" - mentioned earlier - that are located either in strategically important areas or areas where two or more Supply lines meet. Based on how many Supply points the Depots received from their lines to their nation's capital, these Depots, if captured, will yield 10% of those supplies - a "weapons cache" or "POW camp" for example - as instant gain for the attacker. For example, if Germany is sending 1,000 supply points to the front, and there are several places where the train splits into smaller trains, there will be more supplies captured the further west you go. Likewise, more supplies will be captured if you take a depot supplying 5 trains than if you take a depot supplying two trains. Note that Depots must serve a MINIMUM of two trains to be operational.
Depots are marked on the map as fully red provinces for the Germans and fully pink provinces for the Soviets. Supply trains are marked as red and pink dots connected by red and pink lines, for the Germans and Soviets respectively.
In addition, two provinces next to each other that both have a supply line running through are marked as depots. This is because it is assumed to be pretty dang important if two supply lines are right next to each other.
Supply Lines automatically are reconstructed at the rate of one province per day; this means if you take a province connecting a supply line, the supply line will automatically shift it's direction to the nearest way around. If there is no way around your army, then the enemy troops receiving supplies are cut off, and the supply line ceases to exist; it's cargo is instead transferred to a different supply line.
Finally, about Depots that appear to be "cut off"; yes, some Depots have no supply lines running to them. These key positions have a certain amount of supplies in them - dictated by moi. The upkeep of the units stationed there - in addition to taking out of the national supply - also is taken out of the cache located in that particular depot. So if you have a "cut off" depot that is storing 50 points, don't keep an army of 100 Conscript Divisions there and expect them to hold out for 5 turns.