Railroads of the Future(13.未来铁路)

Therailroadsofthenearfuturewillprobablynotinvolveanyspectacularlynewprinciplebutwillbedevelopmentsofthoseweusetoday.Therailadministrationshavebuilttheirentiresystemtoastereotypedmodel,withtwosteelrailsofaparticulartypeseparatedbya“gauge”ofabout1.43m,1.07m,1m,or1.68m.Sumsofmoneyequivalenttohundred ......(共5689字)[阅读本文]>>

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