Trains don't because they are too slow. Fast freight shipping is possible if the tracks are built for it. Small parcel shipping through high speed passenger tr

Trains don't because they are too slow. Fast freight shipping is possible if the tracks are built for it. Small parcel shipping through high speed passenger train is also feasible, and I think already done. Ocean carriers are quite efficient, but they need to run on fossil fuels, and especially dirty ones at that.