This photo is taken at Mumbai Central Station, just before the train arrived. There is slime and muck here besides litter like empty cartons and paper waste.
This pic is taken at a suburban railway station. The railway track is full of litter. Waste paper and plastic.
The following photo was posted later, and taken in July 2015, near V.T. station. It does appear as if commuters dirtying the tracks is not enough. Households next to the railway lines used the tracks as a garbage dump!
Related Images: Garbage on the roads in India or People peeing and shitting on the streets in India or KFC Garbage