As noted above, there is no direct train from Singapore to KL. The train operator is Malaysia's KTMB. You would take the train from JB Sentral. Multiple options exist to get to JB Sentral from Singapore e.g. several buses from Queen Street or even KTMB's rail shuttle from the Woodlands station.
Originally Posted by
C17PSGR
just wondering if the train is more interesting from a cultural factor.
Culturally interesting is always relative. I think the rail journey could be interesting if the following intrigues you
1) Passing through several town centers on the way. There is no way to see these towns if you take the bus or car (both would use the extremely boring North South PLUS highway).
2) Squatter houses on KTMB land. This has/is been a huge problem.
3) Tropical flora and fauna. The rail journey wends through palm plantations, durian/pineapple plantations and so on.
4) People watching
5) Railway fan. KTMB operates diesel locomotives on this route. This one day will disappear as they are moving to electric sets.