I have never been on a train but love watching them.  I like to count how many train-cars are being pulled! 
It's so much different than cars because you're being guided by the tracks instead of on a prepared flat surface
I know!  They are so powerful and loud!  How fast can they go?
It depends on the type.  Power either comes from electrification system or they produce their own power, usually with diesel engines.
Where does the electricity come from?
From the railway electrification system.  Most tracks also have a signaling system.
What does the signaling system do?  Is it to alert cars?
Railway electrification system
A railway electrification system supplies electric power to railway trains and trams without an on-board prime mover or local fuel supply. 
Electric railways use either electric locomotives (hauling passengers or freight in separate cars) or electric multiple units (passenger cars with their own motors). 
Electricity is typically generated in large and relatively efficient generating stations, transmitted to the railway network and distributed to the trains. Some electric railways have their own dedicated generating stations and transmission lines, but most purchase power from an
in my interview,' because I spoke candidly about our relationship and I felt my loyalty is to Ray, it's not nowhere near to Teairra. I don't even know her like that, and at the end of the day, why are we gonna go back and forth about how you tried to holla at me...you know what you did...I've got bigger things to worry about than being trivial over some pussy, especially when there's so much pussy out there. I've been called worse by