Sad to know that. I guess no rules are in place to keep such people quiet. In Bangalore City Buses (BMTC) we have a good and strict rule that anyone listening to songs on mobile phones on speaker mode or talking very loudly can be off-loaded from the bus by the trip conductor. If the erring passenger refuses to oblige then the bus is directly driven to the nearest police station. Something of this sort must also be applicable on Indian Railways. It is disgusting to hear slang, especially when travelling with family.