MB,
All good points. Also don't forget you don't have to upgrade all at once, they can upgrade the signals as the bulbs burn out. That's what they've been doing on crossings around here for a little while. Only thing is the bulbs seem to last forever...
So it might make sense for Amtrak that carries people around on trains, but on the freight-lines it might not make sense except for energy usage in the middle of nowhere, where solar could also come in handy.
Ian A.
