You are such an awesome builder @soocoolsim! And quick too!
I like option B best. I love the symmetry and spaciousness of it, and it keeps the double wide hallway on both sides of the car. I do have a few suggestions for it, if we go with that one.
I'd slide the double windows of the outside larger compartments one tile to the outer edges and move the bunks to the inside walls next to the smaller compartments. This allows you to make those right angles cutting into the hallways diagonals, mirroring the diagonals in the kitchen and allowing more maneuver space for the hallways. (But I do like the little circle windows on the outside, so it's only a suggestion.)
I'd also like the rear window centered if possible by MOOing another window next to, and over, the existing one just one tile over, making the two two-tile windows into a larger three-tile window.
Those suggestions would also work for option A. However, I like the maneuverability of the second kitchen better. It is just more spacious with the diagonal walls adding more room for sims to get around each other.
Option C windows bother me as I like symmetry too much. Moving the second double window over one tile on either side and replacing the center window either with a larger or smaller window would make it more appealing to me, ie. you could use the little circle window again in the middle and have one space between all the windows, OR you could MOO the same double window over the existing center window, just one tile over, making it a triple-wide window. Obviously, this option adds much more maneuver room and would play the best. If set up like option B, which is my favorite layout, I'd happily build in this one.
So, I like B or C better than A, but would just alter some windows on my train; if you wouldn't mind.
@romagi1 - I am glad you are finally feeling better. I hope your hubby recovers quicker with you to help nurse him. With all been coughing and fighting colds with this much colder weather than normal. Hopefully, the worse is over now and the immune systems can tackle whatever they need to tackle. Hugs and warm thoughts.