To me I built "our" railroad with my kids. My youngest son and youngest daughter helped layout and build our train set that is almost finished. ( will send pics when it is.)
That is the best thing about Model trains the kids don't sit in front of a TV for hours. or play on there cell phones.. They are with you playing "trains" talking, critical thinking about how to pull 12 cars with only 1 engine.
:) bonding as a family...And you throw my 2 grandkids in the mix... It does not get much better then that.. Our family proudly says... "Yes......Yes we do still play with trains..".