There are 3 train companies operating 4 routes - 135 (GW), SW 81, Cross Country, 123 (GW). The cheapest train costs $62 and is 7h 17min.
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There are 4 ways to travel from Totnes to Rowlands Castle. 3 trains, 4 buses, 1 flight and 1 by car are possible between the two areas. The by car from Totnes to Rowlands Castle is the cheapest and fastest. The train operated by running from Totnes to Rowlands Castle 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!