BULK BOOKING
In case you require reservation in excess of the above limit of 6 passengers you may contact the controlling officer/Chief Reservation supervisor of the concerned reservation office for permission to book more number of passengers in a group. However, such booking of bulk accommodation is available only after 10.00 hrs on computerized reservation system subject to overall limit on trains as per extant rules and availability of accommodation . Here is step by step guide to help in bulk booking of berths
Step I Please submit a letter (in two...
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copies) to authorized` officials giving details such as train number, date of journey and of berths and the list of passengers.
Step II Get the permission of the authorized officials
Step III Contact the bulk booking counter for purchase of tickets

@bantiblg: Re# 231565-0
I have sourced the following information from yahoo answers website:
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/Five Simple Steps to book a Special Train/Coach
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1)Register...
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Yourself by paying Rs. 10,000 per coach by cash to the Station Manager of the journey commencing station or Demand Draft in favour of Chief Cashier ,Central Railway ,Mumbai CST at Cash Office as registration *** security charges. [ At least 15 coaches would have to be booked for a special train. Hence a minimum of Rs. 1,50,000 shall have to be paid as registration *** security charges for booking a special train. This has been revised from the earlier minimum composition of 18 coaches. The instructions hold good in the period w.e.f 10-10-2007 to 31-03-2008 and further change will be duly advised.]
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2)Submit an Application in the prescribed format to the Chief Passenger Transportation Manager of the Railway on which your journey commences at least 30 days in advance or a maximum of six months prior to the commencement of the journey. Attach Xerox of the money receipt obtained by paying registration fees.(Application Proforma can be downloaded from the Central Railways website centralrailwayonline.com)
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3)Await Acknowledgement which shall indicate your position on the waiting list. Final Programme will be confirmed only after examining operational feasibility and haulage confirmation from other concerned Railways.
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4)Collect Final Confirmed Programme copy and folder from the office of the Chief Passenger Transportation Manager at least 72 hours before the date of commencement of journey.
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5) Approach the Station manager of the journey commencing station with full list and details of ‘ intending’ passengers at least 48 hours in advance for preparation of your ticket.
Source(s):
self experience, central railway
1 year ago

Q. What is Bulk (Block or Group) Booking ? What is the process of this booking ?
Ans: Passenger travelling in a group of more than 6 persons in same train, same boarding place, same destination, same date and same class is called Bulk Booking.
This type of booking is mainly done for the purpose of School and college educational tours, Marriage party or pilgrim tours.
for...
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making bulk booking head of the group or principal of college or school request Chief Reservation Supervisor in writing to permit such booking giving the reason of group booking. The CRS permits bulk booking for only one third of the available quota on that time. After getting permission from CRS passenger can book the tickets on designated window. All type of concession can be availed in bulk booking. The most important facility in bulk booking is facility of NAME CHANGE. Name change is permissible for 10% of total strength of group without the hurdle of family relation. This booking can be done 89 days in advance only.
Hope i had included every feature of this booking. E & O E
thanks