I think trolley problems suffer from a different type of oversimplification.
Suppose in your system of ethics the correct action in this sort of situation depends on why the various different people got tied to the various bits of track, or on why ‘you’ ended up being in the situation where you get to control the direction of the trolley.
In that case, the trolley problem has abstracted away the information you need (and would normally have in the real world) to choose the right action.
(Or if you have a formulation which explicitly mentions the ‘mad philosopher’ and you take that bit seriously, then the question becomes an odd corner case rather than a simplifying thought experiment.)
When writing on the internet, it is best to describe children’s ages using years, not their position in your local education system.