You can try either 12.45 p.m or 03.01 p.m trains.
search with official web site of SLR
start station : NANUOYA end station: ELLE
Train no 1005 (Podi Menike) & train no 1015 (Udarata Menike) are the blue trains. as above 12:45 hrs & 14:50 hrs are the leaving times
Many thanks for replying. I am going to catch the 12:45 train. Where can I buy a 2nd class ticket?
See the link given above, explains it all in detail (unreserved and reserved, day itself or in advance).
<Erik> & [Sandya]