One of the many WW1 WI/PODs is that somehow the Straits remain open or are forced open, thus allowing Russia to trade via the Black Sea, which could help assuage economic and social pressures. Anyway, one alternative to this option is the TS Railroad, which was newly built at the start of the War.
Now, IOTL I understand that the railway wasn't as helpful as it perhaps was later, in WW2, for reasons of capacity and of course the capacity of a railroad will likely never be equal to modern shipping. I would also expect that Russia's capacity, pre war, to massively upgrade the newly built railroad was probably rather limited. But is this true? Could have Russia mustered the will, capability to justify a substantial upgrade to the line (by any route), by either the start, or early in WW1? If so, would that help much?
Now, IOTL I understand that the railway wasn't as helpful as it perhaps was later, in WW2, for reasons of capacity and of course the capacity of a railroad will likely never be equal to modern shipping. I would also expect that Russia's capacity, pre war, to massively upgrade the newly built railroad was probably rather limited. But is this true? Could have Russia mustered the will, capability to justify a substantial upgrade to the line (by any route), by either the start, or early in WW1? If so, would that help much?