Upvote:7
First of all, here are the names in Thai of the stations you want. Mahachai and Ban Laem are really the same place, but you need to cross the river after arriving at Mahachai to get to Ban Laem, where the second leg begins.
วงเวียนใหญ่ = Wongwian Yai
มหาชัย = Mahachai
บ้านแหลม = Ban Laem
แม่กลอง = Mae Klong
The timetable you’ve posted is only for the second leg (Ban Laem to Mae Klong). Here’s a link to the railway.co.th timetable for the first leg:
As you can see, trains leave Wongwian Yai station every hour or so starting at 5:30 AM, and it takes about an hour to get to Mahachai. I’ve taken this train several times but never gone further than Mahachai. It’s basically a big market and has some excellent seafood restaurants.
By the way, these trains are free for Thai citizens, but not for tourists. It should cost around 20 baht for the first leg, as I recall.