If you have already have a track dedicated to the ground-effect airplane, seems to me that it'd always be more cost effective to build a railroad on that track

If you have already have a track dedicated to the ground-effect airplane, seems to me that it'd always be more cost effective to build a railroad on that track and move more people. The track is the hard part. Ground-effect vehicles might make sense over water, though, building effectively a very fast ferry. There's a startup from the last YC Batch trying it. Regent: https://www.regentcraft.com/ https://www.regentcraft.com/