NUTS Unrealistic Train Set (as it's current name goes) is meant to be based on being perfectly playable with zero link to any "real" engines or whatever. The aim overall is gameplay from 1920 till past 2050 for all climates and include support of FIRS, ECS and PBI. Trains are divided into 5 categories in which a new generation comes every decade; by spreading the trains in the decade, a new train comes every 2 years which should make for a truly entertaining game because at the same time the player can choose from multiple reasonable options at any point of the game.
Madness knows no limits!
Fear the chiprel!
Downloadable from http://bananas.openttd.org