goa to kerala

going to goa in feb and would like to go to cochin by train
can you book return tickets and am I better booking at margao station when I get to goa ?

Train No 2618 MNGLA LKSDP EXP leaves *MADGAON at 19:25 to reach ERANAKULAM JN (near Cochin) at 10:00.
Train No 6345 NETRAVATI EXP departs from *MADGAON at 22:40 and arrives in ERANAKULAM JN at 14:05.
Kerala Sampark Kranti Express is a third option.

For booking tickets online : www.irctc.co.in
Register on the site first.
You can book e-tickets upto 60 days in advance.

Along with a dozen or two others it seems yes, see also http://www.indiagroove.com/ which you seem to be acquainted with and the railways site you gave. As so often, it might be handy to the original poster to know you're still trying to figure out how to get around and what to do in Goa yourself, going by your own queries.

Malcno, I don't think there exist return tickets as such no, you buy separate tickets to and fro, which can be done in one go however. If I'm not mistaken...

For the most useful train info on Goa to Kerala, see this thread:
Train information

http://www.indiagroove.com/ is a beta site under development.

It is a fantastic piece of work by IMer Shaktipalooza, but it should not be used without cross-checking. Shakti would, no doubt, be very interested to hear of any errors found.