You can check your train PNR status by following ways:
Through SMS:
You can check reservation status of your ticket through mobile by sending SMS to any of these numbers. These numbers are 54959. 139, 5676747 and 57886.
PNR <10-digit PNR number> to 5676747
PNR <10-digit PNR Number> to 54959
PNR <10-digit PNR Number> to 139
IRPNR <10-digit PNR Number> to 57886
Through Call:
Dial 139 and talk to operator