You are having various method for checking your Train PNR status through Online. If you are booked your Train ticket online through IRCTC website you are having the option for checking the PNR Status through the IRCTC website. Simply log in to the website and book to booking history and click on the ticket you had booked and there you can check the PNR Status.
For Checking PNR status through Online Visit indianrail.gov.in/pnr_Enq.html and enter your PNR Number and click on Get status.
Official website of southern railway www.sr.indianrailways.gov.in provides various facilities like
PNR Status checking
Spot your Train
Trains between Stations
Seat Reservation etc
You will get PNR status through SMS also
Simply send your 10 digit PNR number to 9773300000 and you will receive the PNR status to your mobile. Normal sms rate will be applicable. If you had free National SMS its free.
You can also send SMS to 139 for getting the PNR status. Simply sms PNR 10 digit PNR number to 139. Premium sms rate applicable. ie, Rs 3.
You can also download Railway Enquiry Mobile Application for Free which helps you to check PNR status, Train Arrival and Departure Time, fare Enquiries, Accommodation availability etc. But Rs 3 will be applicable for one search.