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What technological and financial barriers prevent proposals for partial nonrocket spacelaunch such as magnetic levitation trains from becoming a reality? These systems, if created, could substantially reduce the delta-v required by rockets to achieve orbit.

I would exclude space elevators from this discussion, as those have already been discussed at length elsewhere.

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closed as too broad by Undo, Gwen, PearsonArtPhoto, James Jenkins, Danalog Jul 18 '13 at 17:20

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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    $\begingroup$ I feel like this paper covered it pretty well: hindawi.com/journals/ijae/2012/830536 it might help someone trying to write an answer. $\endgroup$ – AlanSE Jul 18 '13 at 16:10
  • $\begingroup$ Could you perhaps specify a specific technology you're interested in? As it stands this question is too broad. $\endgroup$ – Gwen Jul 18 '13 at 16:39
  • $\begingroup$ Since the space elevator is already discussed, maglev or gun systems seem (to me) to be the most realistic proposals. $\endgroup$ – Robert Mason Jul 18 '13 at 16:45

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