In this file photo taken on June 15, 2022, congress party activists shout slogans against Indian Prime Minister Narendra Modi and the government during a demonstration in Kolkata to protest the Enforcement Directorate questioning of Congress leader Rahul Gandhi in connection with the National Herald money laundering case. (DIBYANGSHU SARKAR / AFP)

LUCKNOW, India - Crowds in India set a train coach on fire and blocked railway tracks and roads in protests on Thursday against a new military recruitment system, police said.

Prime Minister Narendra Modi's government this week announced an overhaul of recruitment for India's 1.38 million-strong armed forces, looking to bring down the average age of personnel and reduce pension expenditure. 

The new system, called Agnipath or "path of fire" in Hindi, will bring in men and women between the ages of 17-and-a-half and 21 for a four-year tenure, with only a quarter retained for longer periods

Sanjay Singh, additional director general of police in the eastern state of Bihar, said protests broke out in about a dozen locations, with roads and railway tracks obstructed.

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"The protesters set fire to a train bogie (coach) in one place," Singh told Reuters.

"They have ransacked one railway station."

The new system, called Agnipath or "path of fire" in Hindi, will bring in men and women between the ages of 17-and-a-half and 21 for a four-year tenure, with only a quarter retained for longer periods.

Previously, soldiers have been recruited by the army, navy and air force separately and typically enter service for up to 17 years for the lowest ranks.

The shorter tenure has caused concern among potential recruits.

"Where will we go after working for only four years?" one young man, surrounded by fellow protesters in Bihar's Jehanabad district, told Reuters partner ANI. "We will be homeless after four years of service. So we have jammed the roads."

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Bihar and neighboring Uttar Pradesh saw protests over the recruitment process for railway jobs in January this year, underlining India's persistent unemployment problem.