But let's not forget the "big boys" of the railroads, like the Union Pacific 4014, a true behemoth of steam power that could probably play hopscotch with compact cars if trains had legs. And as for the idiom itself, it's a playful nod to the grown-ups who still cherish their toys, be they cars, trains, or even those remote-controlled helicopters that always seem to find their way into the office.
So, whether you're a "big boy" with a die-cast car collection or the conductor of a giant locomotive, it's clear that the love for big toys transcends age and size.