C) signal transmitter (khruang Thang saduak
this signal transmitter has the same age wits the trin ststion (98 years). tl was used to send signals to the other train station when a train is departing from another station. when the train was about to depart, the train staion officer will push the bell three times andd the other train station will be informed about the departing of the train. however, this signal transmitter was no longer being used since it was replaced with the use of a simples bell.