FWIW, your numbers are off by a factor of two: Panamax ships carry up to 5,000 TEUs; Neo-Panamax, introduced after the canal's expansion, 14,000. Beyond that,

FWIW, your numbers are off by a factor of two: Panamax ships carry up to 5,000 TEUs; Neo-Panamax, introduced after the canal's expansion, 14,000. Beyond that, I think OP was referring to a hypothetical piece of infrastructure that would dwarf anything we've ever built on this planet: drydocking the entire loaded ship and moving it across Panama on a massive rail system capable of moving entire ships across the land.