Wouldn't large container ships and trains be the perfect candidates for electrification? Create some sea can sized batteries that can easily be loaded on to and

Wouldn't large container ships and trains be the perfect candidates for electrification? Create some sea can sized batteries that can easily be loaded on to and off of the train/ship. The infrastructure already exists for loading them, and they are used to carrying sea cans already. As I understand, ships are huge carbon emitters so if you could load a dozen sea can sized batteries, perhaps it could power it across the Atlantic (or maybe it would take a 1000 sized batteries, which would make it impractical).