[infinite93]

Last time I looked into it, there seemed to be 3 main factors in a non-trainer train. Don't forget that in addition to trainers, you have to factor in the 'slight increase to trains' donators see.

Happiness is treated separate from Endurance(total Dev points) and there is a 'random factor' as well. These factors seem to be added together instead of multiplied. This is why people with crazy endurance can get 1:1 or better trains in a cardboard box and people in 'very nice' housing can get 1:1 or better regardless of endurance.

The effect we see where 2 10 pt trains give you more impact at full happiness than 1 20 pt train at the same happiness seems to be based on the 'random' factor. It has a more significant impact at lower point trains than at higher ep levels since it is added instead of multiplied, so it doesn't scale up. I first thought there was some kind of 'each point drops happiness at tiny bit integral thing' going on, but I don't think it is that complicated.