Asking questions again is O.K. Mentioning previous answers is intended as a quick starting point, not to discourage follow-on questions, data, or debate.

These are some links that I found that I'm totally plagarizing from /u/Searocksandtrees from a few weeks ago):

/u/domini_canes in "Why didn't the Allies bomb railroad lines leading to the concentration/extermination camps?" at https://www.reddit.com/r/AskHistorians/comments/1j33ri/why_didnt_the_allies_bomb_railroad_lines_leading/

more from domini_canes, and a now-deleted user, in "What are some specifics on aviation during World War Two? (Detailed questions inside)" at https://www.reddit.com/r/AskHistorians/comments/20wi8k/what_are_some_specifics_on_aviation_during_world/

/u/llordlloyd in "Did the Americans have the ability to bomb railroad tracks in order to disable concentration camps during WW2?" at https://www.reddit.com/r/AskHistorians/comments/78qrul/did_the_americans_have_the_ability_to_bomb/

kugfelfang in "Holocaust Question" at https://www.reddit.com/r/AskHistorians/comments/4agtwe/holocaust_question/