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FullOfStarships t1_jco9rvz wrote on March 18, 2023 at 8:12 AM

Reply to comment by OffusMax in Where do photons go if they've been emitted but are destined to never be absorbed, and would these photons traveling ad infinitum define the edge of the universe (even if space itself were still larger)? by mysteryofthefieryeye

This is wrong (except for any difference proper motion that exists at the time the photon is emitted).

Cosmic redshift is an expansion of space.

Your analogy requires that the train is stretched by the expansion.