There are 3 train companies operating 4 routes - SW 81, 135 (GW), 123 (GW), Cross Country. The cheapest train costs $61 and is 7h 14min.
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There are 4 ways to travel from Rowlands Castle to Totnes. 3 trains, 4 buses, 1 flight and 1 by car are possible between the two areas. The by car from Rowlands Castle to Totnes is the cheapest. The by car from Rowlands Castle to Totnes is the fastest. The train operated by running from Rowlands Castle to Totnes 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!