True. Even wives may not be jealous creatures, at least where locomotives are concerned.
Case in point: An old joke [paraphrasing mine]. From Model Railroader magazine IIRC:
Wife #1 to wife #2: "Don't you ever get tired of him playing with his trains?"
Wife #2: "No, not really. It makes him happy. And it has some benefits for me too."
Wife #1: "Benefits? For you? You have got to be kidding me."
Wife #2: "No, no. It really does. I always know where he'll be and what he'll be doing with his spare time...".
Wife #1: "Uh huh...".
Wife #2: "...and I know that if his eyes ever do stray...
Wife #1: "Uh huh...".
Wife #2: "...they'll stray for a 4-8-4...
...and not a 36-24-36."