We could imagine trains powered by teams of fit peddlers (peddling their bikes :) sitting inside a hollowed out locomotive.

aaargh, down into the galleys with ya matey!

love your idea with the solar trains, i see horse-barge-canal combos probably making a big comeback in some parts of the world, ditto woodgas transportation and low tech windmills for wells and irrigation and enough juice to run dialup internet.

land- and ice- sailing, pedal trains. mules will make a massive comeback...

'The history of public debt is full of irony. It rarely follows our ideas of order and justice.' Thomas Piketty