There are 1 train company operating 2 routes - Silver Star, Capitol Limited. The cheapest train costs $97 and is 10h 8min.
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There are 4 ways to travel from Washington, D.C. to Charleston. 4 buses, 4 trains, 4 flights and 1 driving option are possible between the two areas. The driving option from Washington, D.C. to Charleston is the cheapest and fastest. The train operated by Amtrak running from WAS to CHS is the most convenient.
It's important to check each mode when booking your ticket so that you can find the best method for you. The cost of each type varies differently, so be sure to use Faretrotter to keep an eye out!