Serbia 14 Second Invasion Serbian rail capacity

[Secret45]

Checked out the designer notes and it seems rail capacity can actually change. It says for example the Serbian start out the 1915 campaign with a good amount but it will decrease greatly towards 0 in the later turns of the campaign.

But it seems for the 1914 campaigns things aren't stated that clearly. For example it says in the first invasion campaign the Serbian rail capacity will be enough to move 50% of a Division. The only other mention for 1914 is that rail capacity will be very low in late 1914. In the second campaign it has a initial value of 0 and in the third a value of 1. Not sure if that means the second campaign belongs to late 1914 since it takes place at most 3 weeks after the end of the first invasion.

I can see why the Serbians would loose capacity over time but is it really realistic that they would have less in September than in November? Mobilization would certainly put a burden on it but wouldn't it be quite advanced or finished at this point in time.

Still it would probably better to play my turns with out anticipating the railways as transport options.