If it is Friday evening I hope you have reserved your ticket at least 10 days prior to the journey or you will be out of luck (there are two intercity trains on Friday and Saturday evenings that leaves Colombo at 3.35 pm and the other one around 5.30 pm). When the train makes a slight right at Polgahawela you know everything is going to be perfect for the next couple of days. Skyscrapers will disappear into the mountains of Alagalla and Kadugannawa. The wind will get cooler, calmer and it will smell like something you know. Stressed faces will change into happy faces as you see the signs of home. Kandy here we come!
The intercity train will only stop at the Peradeniya Junction and Kandy and will take less than three hours to complete the journey compared to the 4/5 hour bus ride in the traffic. There are other express trains which stops at other stations and reaches Kandy in less than four hours, and still beat any bus. This journey is a cheap thrill as the entire trip would only cost you between $1 - $5. Where else in this world can you find such an adventurous trip for so cheap? The key thing is to buy your tickets ahead as there are only limited number of tickets. There won't be any vendors on the intercity trains so it is better to buy whatever you need before the journey begins. Sit back, relax and enjoy the epic surroundings of the highlands as some of the views will remain in your memory for a lifetime.
Following Link will guide you through the train schedule:
https://eservices.railway.gov.lk/schedule/searchTrain.action?lang=en
Kandy to Colombo

If you are a tourist and you have a couple of days before heading back to the airport following are some of the cities you pass by on your way to Colombo.
Gampaha - is one of Sri Lanka’s premier Ayurveda centers and is a great place to get some of the islands indigenous medical treatment. The town also has an attractive botanical garden where the first ever rubber tree was planted in Sri Lanka.
Kelaniya - the Kelaniya Raja Maha Vihara (temple) has some of Sri Lanka’s finest paintings and sculptors by Solias Mendis. For those lucky enough to be passing through in December and January the Duruthu perehara is a stunning collection of colour and noise.