I've had an interest in O gauge trains since childhood, but didn't really begin seriously collecting until the last year. I'm mostly collecting O scale Monon, but also include other related and nearby railroads like Nickel Plate.
So, for me, I don't quite know what "enough" is going to look like quite yet. I know I'd like to have pretty much one of every type of diesel in Monon's roster, but that's about all I've decided.