Sky-Trains are designed to high international standards, Doors open and close automatically. BTS Sky-trains connect Bangkok’s leading hotels and major shopping areas such as Ratchaprasong, Silom and Ploenchit etc. Please be aware that the sky-train may approach the platform anytime and from any direction.

Tuk-Tuk are three-wheeled automobiles best used for covering short distances. The Tuk-Tuks are considered as a faster mode transport. Minimum fares for journeys are of up to approximately 25-40 bath

source:: Toruist Guide to Thailand book. Thailand-sawasdee.blogspot.com