The correct answer is: A. Tejas Express
The Tejas Express is a semi-high-speed train operated by Indian Railways. It was the first train to be operated by a private player, IRCTC, under the public-private partnership (PPP) model. The train was flagged off on 17 January 2017 and runs between Mumbai and Ahmedabad.
The Tejas Express is a fully air-conditioned train with comfortable seats, power sockets, and Wi-Fi. It also has a pantry car that serves hot and cold meals. The train has a maximum speed of 160 km/h and covers the distance between Mumbai and Ahmedabad in 6 hours and 15 minutes.
The Tejas Express has been a huge success and has received positive feedback from passengers. It has also helped to improve the image of Indian Railways.
The other options are incorrect because:
- The Shatabdi Express is a superfast train operated by Indian Railways. It is not a semi-high-speed train and is not operated by a private player.
- The Karnataka Express is a mail train operated by Indian Railways. It is not a semi-high-speed train and is not operated by a private player.
- The Duronto Express is a superfast train operated by Indian Railways. It is not a semi-high-speed train and is not operated by a private player.