Railways complaint No by SMS

Railway authorities have introduced a system where one can complain from a running train. The SMS about complaint will be  acknowledged and  attended. Give the train no, bogie no, precise nature of complaint- no water in bath room / no lights / fan not working / security problem or whatever  through SMS. Station Superintendants at Delhi confirm it is an effective tool. The Railway  Number to which you can SMS is 8121281212.