The other main issue with the bio toilets is that it always cannot be cleaned and emptied in its destination especially in cases where layover period is low or else there is no proper cleaning facility/washing line or pit line.
This becomes a big issue for long distance trains. Even the OBHS staff cannot do much about it as there is a different method of removing the blockage which can only be done in a station having such facility. In some of the toilets, have seen the railways have put some kind of cross spring across the outlet which will prevent people from putting bottles etc, but of course will not help in preventing passengers from putting tissue papers, gutka packets etc...
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Ultimately the people have to change