I am a first time Amtrak traveler...I will be traveling on the California Zephyr in June with my adult daughter, and my mother. Mom is legally blind, and uses a cane or walker for mobility. She can climb stairs with some assistance. Some questions: How easy are the steps to navigate getting on the train; and how easy are they to navigate on the train to the upper level? How smooth is the ride...will she be thrown about if she walks around to the bathroom or whatever? I would like for her not be confined to the coach car on the lower level if possible, but want to be prepared...