How do I recognise the Express boat at Sathom Pier

Where exactly and how do you book for the Express boat to go to the Grand Temple.

How much does it cost, do you get a ticket in advance at a booth on the pier or on the boat itself?

How do you recognise an Express boat among all the others?

How do I recognise the Express boat at Sathom Pier

This is their english languaage website with boat photos: http://www.chaophrayaboat.co.th/

The boats are wooden, hard top covered, white with orange markings. The boats arrive from your left every 20 minutes at Sathorn pier and go to the right to get to the Grand Palace. You can pay on board to the conductor, just say ';Ta Chang';, and you get off at Ta Chang pier. Don%26#39;t take the so-called ';tourist boat'; as it will be more expensive.

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