As far as rail transport goes, we're surprisingly close to an efficient system, IMHO. In high population areas with frequent stops, 3'd rail or catenary (overhead) delivery of juice is working fairly well. Great improvements can be made at the substation interface for quick charging of capacitor/battery banks, making for a seamless interface with current "over the road" plug in hybrid, AC, diesel/electric with regenerative braking motive systems, eliminating the costly catenary aspect entirely. As tech. improvements stretch out the required distance between charging stops, less and less on board fuel is used until old #9 is going 100 miles before needing a fix. Surprisingly, nearly all of the above tech. is ancient, going back to the beginning of the 20'th century. Here's what we need: Improved electricity storage. Why can't we crack this nut? Localized electricity production. It makes less and less sense to move juice from Canadian Hydro or windmills upstate to the NY metro area. We should be working on reactor and/or fuel cell tech that is safe enough to put in abandoned athletic stadiums which are myriad in the metro area. If it's safe enough to put in my back yard then it's safe enough to put in yours. Re-mapping, re-vamping of rail corridors with the separation of freight and passenger/light rail in mind. I like the idea of running passenger rail concurrent with the major highway system. Add more opportunities for bikes everywhere, especially in metro areas. I like BG's elevated tubes!