From: Utlima Thule
CAn you answer this. If my rail is showing green, which 90% of the time it is, (unless I move a unit by rail), then that rail is moving everything it can no problem or put another way, moving what depots demand no problem. So rail does not seem to be a constraint or appears not to be, OR is it I don't have that many trains running because my depots are not processing the freight they already get because their own railyard is inadequate level 1 railyards.
lets talk about the green rails.
What you see at the start of the turn is the residual usage from the last turn (ground and logistic phases), some of that usage gets cleared but a portion can remain, especially if you put a lot of units down a track it can take 3-4 turns to clear.
So green more or less means your usage is clearing in the end-turn routines.
Whether this is good or bad really depends.
It can be good, you've basically got the 3 bits in balance, so you have enough trains (from your railyard capacity), enough space for them to move on easily (railway capacity) and your depots are filling up (depot capacity).
But it can also be green because you don't have enough trains to make use of the potential railway or your depots lack the capacity to process any more freight so don't ask for it.
In that case, not so good
But it is getting those 3 bits into balance in the context of a changing combat situation (& possibly enemy interventions) that is the challenge.
You cannot upgrade railyards, right?
Is a unit using its own trucks or its Corps trucks?
No, if it is a level 1 railyard it stays there, so the only dynamic is repair/damage
unit trucks, there are relatively few in the HQs as such and mostly being used for their own movement
...what gets me is the 'puzzle' aspect of this. I roll my eyes when i see people who think that the detail in games like this makes it more 'realistic'. I disagree..it's a bunch of puzzles to figure out how the system works, based upon the designers intent. In practice, its a a lot of investigation that involves greater understanding of the system, and [hopefully] the history involved.
I don't think its a puzzle in the conventional sense, that would imply there is a perfect solution waiting to be found. There are better and worse solutions definitely but as an eg Carlkay is perfectly happy to run his axis logistics in 1941 without super depots while I preplan where they are going to be.
The other bits to bear in mind, the system has in-built shortages, you can overcome the shortage that may arise from depot capacity but neither side at any distance to their NSS can overcome the delivery shortages (trains, rail lines and trucks). Also the situation is always changing, demand for supply is not just a product of your unit deployments and your choices - your opponent has agency too