Well you're right, most girls and women don't understand this train simulator/ model train thing. I also had a hard time understanding why my brother was playing Flight Simulator like 6 hours a day, I was thinking like... Is he a nerd?
Now, as I drive train in real life I get more and more interested in the subject, and don't think train simulator is as boring my "friends" say it was, it's fun, if you like trains. So neither a husband, or wife should interfear with this kind of hobby, unless your driving 12 hours a day? 
 
Also it's a matter of different opinions from different persons views, as I'm only 20 and female, while others in this forum may be in their 50s and are males, there can be a slight difference, as most people get bored of being with the same person for years.