You used to be able to take the train further east on the Sukhumvit line from our stop (On Nut) to any stop for a mere THB 10. That has now increased to THB 15. It's not a great deal but the percentage increase is.
This is typical of how things get more expensive here. Prices remain constant for years and then all of a sudden it jumps quite noticeably and you're PK for another 2 - 3 years.