There are 2 train companies operating 2 routes - 123 (GW), SN 60. The cheapest train costs $42 and is 4h 0min.
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There are 4 ways to travel from Chepstow to Brighton. 4 buses, 2 trains, 1 flight and 1 by car are possible between the two areas. The by car from Chepstow to Brighton is the cheapest and fastest. The train operated by running from Severn Beach to Brighton 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!