Even i was unaware. Came to know only after seeing questions asked by various members like which train's toilet must have flush and which trains tap mUST be self release type. Which seats should have brown cushion cover n which blue. Apart from the common ones lIke sampoorna kranti is faster or tamilnadu. Wap4 windows of HWH shed should be made bulletproof or wap7 windows of GZB shed