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PEPSU Road Transport Corporation (PRTC), the largest bus operator in Punjab state of India, is a state-run corporation headquartered at Patiala. Originally, it was formed as the Road Transport Corporation of the erstwhile state of PEPSU but when it was merged into Punjab, it became the Road Transport Corporation of whole of Punjab. Later in 1966, when Haryana and himachal were carved out of Punjab, they formed their own Road Transport Companies. At present, PRTC operates in almost whole North India.
References
PEPSU Road Transport Corporation Wikipedia(Text) CC BY-SA