<P> Some trains may have composting toilet tanks, which use bacterial action to break down solid and liquid waste before releasing it to the trackbed by way of a chlorine sanitizing tank . </P> <P> In the United States, Dvořák's tune "Humoresque Number 7" became the setting for a series of mildly scatological humorous verses, regarding passenger train toilets, beginning: </P> <P> Passengers will please refrain From flushing toilets while the train Is standing in the station (I love you)... </P> <P> In The Good Soldier Svejk, author Jaroslav Hašek used hypocatastasis to indicate the fruit of hopper toilets, while conveying soldiers' envy and contempt for their general officer: </P>

Where does the waste go on a train