Now that most of the double tracking is done north of KL there are more trains running and there will be more in the future.
Extra trains now from Butterworth to Padang Besar & vv
Butterworth to Ipoh & vv
Butterworth to KL & vv.
There is still the fast, frequent Ipoh -KL service
Trains no longer run to Singapore. They stop at Johore Baru's JB Sentral.
There are a few shuttle trains running from there to Woodlands. Not that good but you avoid the crowd.