Answer:
I come with a train and go with a train and the train doesn't need me but can't go without me.
I love spinach.
I ask no questions but receive a lot of answers. What am I?
If you break me, I'll not stop working. If you can touch me, my work is done. What am I?
Though I am dark Adam married me.
The answer I give is yes, but what I mean is no. What was the question?