Even though XXXXVI Pz.Korps is sitting on the rail, this turn it did not get a good allotment of gas.
Even sitting on rail, you're contending with the Axis Rail Modifier, which for that date and location put your effective supply at .805 of normal
20.4.3.2. AXIS RAIL SUPPLY MODIFIER
There is a modifier that is applied to the delivery of supply to Axis HQ units and combat
units based on the date and the location of the unit that is tracing supply. The modifier, once
calculated, is multiplied times the supplies and fuel being delivered to the unit. The modifier is
equal to ((168 + (5 times the number of months from December 1941, but not to be a negative
number)/weather adjustment) - x coordinate of unit)) + ((y coordinate of unit -69)/2))/100. This
modifier can never be less than .33 or greater than 1.0. The weather adjustment is equal to
1 in clear weather, 2 in mud or snow, and 3 in blizzard.
So as an example, your unit (X100, Y47)) in December 1941 in blizzard weather will have its fuel/supplies deliveries multiplied by ((168+((0)/3)-100)) + ((47-69/2))/100 or 80.5/100 or .805. So, due to this rule, the delivery of supplies and fuel to the unit in 100,47 would be reduced to only 80.5 percent of what they otherwise would have been.
Combine that with this rule:
22.3.4. FIRST WINTER SUPPLY MODIFIER
Axis units tracing supply to a railhead in the affected area (22.3) will have the amount of supply they receive halved after all other modifications.
Now you're looking at 40% delivery to that hex, at that date, not counting any other leadership checks involved.
"War is never a technical problem only, and if in pursuing technical solutions you neglect the psychological and the political, then the best technical solutions will be worthless." - Hermann Balck