If you need to know more you can also look for another CS bro - Interception7, I think over here he should be the best spoke person for this station =)
Actually, there is a train schedule online. It's still pretty accurate, the last time I checked.
By the way, if you're intending to shoot at the railway tracks, you ought to plan what shot you want before going, especially if you want to include the train, since it comes infrequently.
By any chance, is this the online train schedule you were talking about?
Couldn't find much info about the Railway Station Train schedules...
I am not sure if the one at clementi already closed down. You might wanna try there.