However, timely intervention of railway officials ensured that no passenger suffered injuries in the incident, said Vijayawada Station Manager N Suresh Babu.
He said the agitators, gathered at Tuni to attend a public meeting addressed by their leader and ex-minister Mudragada Padmanabh, pelted stones at the train and attacked some police personnel, before ransacking the railway station.
The demonstrators also blocked portion of national highway 16, bringing vehicular traffic between Visakhapatnam and Vijayawada to a halt in afternoon.
The incident forced authorities to stop all trains running between Visakhapatnam and Vijayawada stations, causing a huge inconvenience to passengers.
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South Central Railway CPRO M Umashankar Kumar said, "After the passengers in the coaches got down from the train, four coaches were set on fire. However, passengers are safe".
Confirming the incident, state Additional Director General of Police (Law and Order) R P Thakur told PTI: "They have set on fire four bogies of the train besides damaging some police vehicles including torching two police vehicles. Our people are trying to control the situation. Additional forces have been rushed to the spot".
According to sources, one police constable sustained injuries in stone pelting at the spot.
In view of the agitation, at least 15 passenger trains running on the Vijayawada-Rajahmundry-Visakhapatnam section of Vijayawada division have been regulated.
Padmanabh demanded that the government should immediately
issue two GOs (Government Orders) including one granting the Backward Class status to the community and another sanctioning Rs 1000 crore to the State Kapu Welfare and Development Corporation.
Kapus are mainly concentrated in the coastal districts and Rayalaseema regions, besides in North Telangana.