How do I reach IIT Hyderabad by train?

The previous answer mentions MMTS. MMTS are the local intercity trains. They run across Hyderabad and the neighboring suburban areas that connect Hyderabad, Secunderabad, Falaknuma, Lingampally, Medchal and Umdanagar. 

If you miss the special IITH bus and want a more affordable option than cab/auto, here is another option. You can reach Patancheru bus complex by auto. From there, you can take a bus to Medak. There isn’t a bus stop near the campus. But the college has a request bus stop allotted by TSRTC. You can ask the conductor to drop you off at the IIT Hyderabad main gate. From there, the college bus will take you inside the campus. The college buses arrive every 15 minutes at the main gate. 

The tall college buildings will be visible to you from the highway, suggesting that you are reaching near the campus.

Despite being called IIT Hyderabad, its campus is far away from the main city and is situated in Sangareddy district, a neighboring district of Hyderabad. My brother used to travel by train and told me about his route. 

Lingampally Railway Station is the nearest railway station to IIT Hyderabad and to reach there, all you need to do is board an MMTS from Secunderabad or Nampally. There is a special IIT Hyderabad bus service from here that will directly drop you inside the campus within 50 mins. 

There are around 4 buses running every day and to know the details of the timings of buses you can contact the transport secretary of student gymkhana. 

If you failed to catch the bus, don’t be sad as there is another way too. You can hire a cab or an auto rickshaw that will drop you directly to the campus but it’s very expensive.