Quickest 7h 25min
There are 1 train company operating 3 routes - Coast Starlight, Southwest Chief, Pacific Surfliner, 4 flights from GCK to PRB. The cheapest train costs $223 and is 1d 2h 52min.
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There are 3 ways to travel from GCK to PRB. 4 trains, 4 flights and 1 by car are possible between the two areas. The by car from GCK to PRB is the cheapest. The flight from GCK to FAT is the fastest. The train operated by Amtrak running from GCK to PRB 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!