Indian Railway provides SMS (Short Messaging Services) short codes for checking PNR, train availability, trains between two stations and ticket availability. See the list, though it is very confusing. The webpage is not user friendly at all. Indian Railway provides these SMS inquiry numbers : 5676747, 55888, 56677, 58888, 57886.
For example, see how 5676747 works, provided by railZone.
sms TRAIN to 5676747 to get the list of functionality.
Welcome to railZone
send sms to 5676747
PNR – PNR status
TL – Train List
TA – Ticket Availability
TD – Train Delay
Checking your PNR status
You can also check your PNR status by simply sending the PNR number to 5676747
Example: PNR 1234567891
Checking for Trains running between two stations.
Send either the station name or station code. Name of the city must be a single word without spaces.
example: TL Delhi Mumbai
Checking for Ticket Availablity
Example: TA 2432 delhi mumbai 1Nov
Currently the service is available on airtel, idea, BSNL, MTNL, Spice, BPL, Vodafone and Reliance.