I think the Union Pacific big boy would be a good choice there is a lot to them and you could take rail excursions and double head with other trains like the Union Pacific 844 or other big boy’s maybe even the southern pacific daylight hauling freight trains and excursions,rail tours over the wasatch range
I want the #4014 Big Boy and FEF3 #844 with excursion passenger cars. SP #4449 and ATSF 4-8-4s #3751 and #2926 are must-haves for me, too.
This would be a steam train which would interest me if it was built with good functionality. it's an iconic one.