The average railroad freight rate in 2007 was about 4 cents per ton-mile (1 ton moved 1 mile). Modern hopper cars are 100 Tons (not sure if that's gross or net, but I'll assume net), so it costs about $4 to move one car (100T cpy) one mile.
However, railroads are deregulated, and the rate for coal is lower than average. In 2007, while coal was 44 percent of the railroad ton-miles, it was only 21 percent of railroad revenue. So as a first guess, figure on $2 per car-mile (2c/ton-mile). Coal-to-gasoline plants are projected to be mine-mouth or close to it, to minimize transportation costs.
Another approximation that might be useful in this discussion. One ton of coal is equivalent to about 3 barrels of crude oil, in terms of hydrocarbon content.
It is estimated that, currently, gasoline from coal is competitive with $35-40/bbl crude.
http://www.aar.org/PubCommon/Documen...y/Overview.pdf
http://www.nma.org/pdf/liquid_coal_fuels_100505.pdf