This is neat. I had to read it all the way to grasp everything though. The exact mechanic she used to kill should have been presented when Kaiser bought it, rather then it being a 'reveal' further below.
For the Genre, this is a great in-depth exploration of the character - really a work of fiction that frames her. I like the tone of your world and your writing - it is very coherent and very consistent. Top quality work here.
These are neat, apart from the lethality of the rails. I would have the rails only energize when a train was a mile or less down the tracks. Otherwise this will cause massive economic damage - you would need tunnels or overpasses everywhere.