Both have their advantages and disadvantages.
The rivers and associated infrastructure have been damaged/altered by flooding and lack of maintenance, however if suitable shipping can be found (shouldn't be too hard) or manufactured, it does offer a cheap way of shifting build goods relatively safely (marauders would have a harder time attacking a vessel in mid stream than on land).
The railways have also suffered from damage and neglect. Floods wash out bridges and causeways, nukes destroy vital hubs, even sabotage by a number of different parties is possible. However, it's easier to repair damaged rails than dredge the river.
Either way could work, just as either way could be the worst hell on earth for those trying.
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
Mors ante pudorem
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