SB) is a suburban rail service of the Multi-Modal Transport System of Hyderabad, India.

[1] Spanning 11 stations, it runs between Secunderabad and Bolarum 5 times a day.

[2] The Secunderabad–Bolarum route is one of the oldest suburban rail in the city of Hyderabad, established by Nizam's Guaranteed State Railway.

[2] Secunderabad–Bolarum route is scheduled to take off as a part of the phase 2 of the Hyderabad Multi-Modal Transport System in December 2018., however was delayed due to paucity of funds.

[5].Finally, 13 MMTS Services along 2 routes under the MMTS phase 2 was inaugurated on 8th april 2023 on Secunderabad medchal & Falaknuma Umdanagar routes by PM Narendra Modi.