Indian railways train arrival and departure can be checking by sending SMS using your mobile phone.
The SMS format should be <AD Train No. STD Code >
The SMS the message to 139.
Example :- if you want to find the departure of Train no 2637 from Chennai. Then the following SMS needs to be sent to 139
AD 2637 044
and the result is
Tr : 2637-PANDIAN EXP Stn Name ; CHENNAI EGMORE Stn to Start: 24 feb 10 21;45 Exp Dept : Ex-21 :45 24 feb 2010 Late by : NO DELAY Hrs