so then more validation for boats/trains to cover the longer distances.
I feel like everything before the first gas powered truck is "local" use only. The first gas powered truck onwards is dependent on what the situation is like based on your server's Oil Baron/s. If they have a large Network of gas and can supply a lot of it in a large area then maybe the Boats/Trains aren't needed as much.
I'm not sure how boats (I omit trains, as that's not going to happen during EA) can help with that exactly, given it will be unlikely there is water access to everyone and boats will be distinctively slower than trucks - which will also get trailers as an addition for road transport. Trucks can be put on a type of boat, though, the idea is indeed the mass storage, I just personally never understand why people want that, given it seems many people cheat their stacksizes up anyway. I'm not sure those would swap to boats. And if you just up the stacksizes, you certainly don't need them at all.