Union minister of state for communications and IT, Gurudas Kamat, launched the railway reservation system for providing tickets at four post offices in Mumbai on Monday.
"The project would not only reduce the queues at railway stations but also reduce load at railway centres," Kamat said.
Chief post master general M S Bali hoped that the facility would generate additional revenue for the Posts.
Union railway minister Mamata Banerjee had announced the initiative during the budget last year to make the facility available in 500 post offices across the country.
The facility would soon be extended to as many as 103 other post offices, he added.
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