yes tickets are available online
you have to visit www.irctc.co.in
you must be having a user id for it(if not then create new one, which is very easy) + you must be having a payment method accepted by irctc to book tickets online(either credit card(visa), debit card, cash card or net banking.
still if you are not able to book tickets due to any...
more... reason then you can contact any of the irctc auth e ticket agent available here for bookings. The list of some auth agents is given below admin member list.
I am also auth e ticket agent. If you want any help in booking matters feel free to write @ jitesh6781@gmail.com or call +919907750231
:)
SHUBH YATRA