The SRT recently conducted public hearings in Chachoengsao to gauge local opinion on the project, which will pass through the province upon completion.
Public concern at the hearing included whether locals would still be able to access the route, due to its pricing.
Mr Chulathep said a City Line running along the same route will be offered at a different price, stopping between cities along the way.
Ticket prices for the City Line will cost 13 baht with add-ons of 2 baht per km.
According to Mr Chulathep, the City Line trains will travel at 160km per hour.
In addition to the high-speed rail services and City Line trains stopping between cities, another City Line route taking passengers from Don Mueang to Suvarnabhumi will also operate on the railways, Mr Chulathep said.