How to Make Group Booking on IRCTC Trains?
Briefly

Group ticket booking through IRCTC is currently only available at railway station counters, requiring manual submission of forms and identification documents.
For group bookings, the Station Master can allow bookings for up to 50 passengers, while bookings for over 100 require higher official approval.
To make a group booking, travelers must gather all necessary passenger details and provide an authorization reason to the relevant authorities before proceeding to book.
Two copies of ID proof per passenger are needed for group ticket bookings, and these must be completed at least 48 hours before departure.
Read at redBus Blog
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