Reminds me of ... I think it was All Your Bridges Rusting? (Niven) Mostly about teleportation, but it's basically the whole "if you bring a 747 back to 1912, ca

Reminds me of ... I think it was All Your Bridges Rusting? (Niven) Mostly about teleportation, but it's basically the whole "if you bring a 747 back to 1912, can you do anything at all for the Titanic" thought experiment. (So this could be surprisingly difficult even with major propulsion leaps...)