Shiv Ganga doing MPS thru a Jn - on every RailFan's bucket list

I wish to know what happens if I cancel a tatkal WL ticket before chart preparation? (Say as 1 hour prior to chart preparation)
Do I get full refund or don't I get any refund.
I know that after chart preparation the WL tkt automatically gets canceled from IRCTC & money refunded.
Also I wish to know why they r not willing to refund...
more...

at least 50% of the booking amount in TATKAL cancellation?
Some of this forum members know my yesterday's situation. My tkt was CKWL 6 & 7 and not got confirmed. Still I tried very badly (traveling 100 kms from Coimbatore to Shorannur) to get a berth by chasing TTEs, this that & what ever method I know. All in vain. My children were crying so bad that they couldn't meet their father. They get only 10 days leave only for half yearly exams.
Even station staffs felt very embracing seeing them and in fact almost 5 ~ 6 staffs came in to convince them with cookies & chips (I m very grateful to them for such a kind heart). But it was the biggest pain I came across as for as traveling is concerned.
If railways allow at least 50% refund, ppl who booked in tatkal but cannot travel, will surely cancel the ticket since they are sure they are getting back 50%. Bcoz of such an id**tic method whomsoever seriously wants cancel also won't cancel thinking what do I get if I cancel.
Genuine & needy passengers like me are seriously in trouble bcoz of this. Unless someone cancels the tkts my tkt won't get confirmed when all the quotas are full.
Just my 2 cents.... Comments are welcome
Regards
A Painful Mother