0_Apprentice
I have never been on a train but love watching them.  I like to count how many train-cars are being pulled! 
1_Wizard
It's so much different than cars because you're being guided by the tracks instead of on a prepared flat surface
0_Apprentice
I know!  They are so powerful and loud!  How fast can they go?
1_Wizard
It depends on the type.  Power either comes from electrification system or they produce their own power, usually with diesel engines.
0_Apprentice
Where does the electricity come from?