"
She serves him mashed potatoes
And she serves him peppered steak, with corn
Pulls her dress up over her head
Lets it fall to the floor
And does she ever whisper in his ear all her favorite fruit
And all the most exotic places they are cultivated
And I'd like to take her there, rather than this train
She takes care of her husband or boyfriend as she is supposed to within her role as the significant other. And just as a spouse or wife. She undresses and shares a bed with him. I believe the writer is saying that he knows they are together at night and that possibly they are intimate. But he wonders if she shares the same secret desires with her mate as she does with him. All the places where the forbidden fruit of a secret love grows. This is where he wants to take her forever. I believe the train is a metaphor for a long endless journey for which he sees no end. It's possible that he fears it may always remain, (their relationship), the way it is now.