Romania & the Ukraine have electric trains all over the place. I'd bet that Albania has them too.
Why not Silicon Valley?
(for those of you asking why is electric better: lower Co2 emissions in sunny california. It's quiet, so you can get your work done in peace. probably missing another plus point. )
http://www.caltrain.com/projectsplans/CaltrainModernization....
You obviously haven't ridden it recently because signs are posted up at the major stations about it.
Caltrain uses cars that are 26 meters long and 3 meters wide[1]. That's 78m^2 of area to catch sunlight. The largest trains have 6 passenger cars and one locomotive. Let's cover all 7 in solar cells, giving 532m^2 of sunlight. At noon on the equator, approximately 1kW/m^2 of energy hits the earth. The bay area is around 37ºN latitude. sin(37º) ≈ 0.6x the energy per unit area. While 600 watts per square meter sounds like a lot of power, we must also account for solar panel efficiency. The best commercially-feasible panels are around 19% efficient. That gives us 114 watts per square meter. Multiply by the total area and we have 60kW of power at noon on a cloudless day. To compare with your car: 60kW is 80 horsepower. The locomotives used by Caltrain put out 3600-4000 horsepower[2].
To sum up: 26m * 3m * 7 * 1kW/m^2 * sin(37º) * 0.19 ≈ 60kW.[3]
On a cloudless day at noon, with no tunnels or shade on the tracks, solar cells could generate 2-3% of the train's needed power. As I thought, not even close.
1. http://en.wikipedia.org/wiki/Bombardier_BiLevel_Coach
2. http://en.wikipedia.org/wiki/MPI_MPXpress
3. http://www.wolframalpha.com/input/?i=26m+*+3m+*+7+*+1kW%2Fm%...
To me, failing to perform such basic calculations is just as annoying as not reading an article, then asking a question related to its contents.