There are 2 train companies operating 2 routes - Cross Country, ECML. The cheapest train costs $94 and is 5h 26min.
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There are 3 ways to travel from Monmouth to Cambridge. 4 buses, 2 trains and 1 by car are possible between the two areas. The by car from Monmouth to Cambridge is the cheapest and fastest. The train operated by running from Stonehouse to Huntingdon 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!