I would agree, but I think the problem with trains is you have to load and unloa...

I would agree, but I think the problem with trains is you have to load and unload the containers onto railcars.

I've seen UPS and FedEx semis pulling 3 short trailers on interstates. I assume they're only limited by current regulations on weight and length.

Triple trailers are only legal in some states and turnpikes.