This is the 8144th most frequent Korean word.
gtx에
"GTX에" refers to "on/at the GTX," where GTX is an abbreviation for Great Train eXpress, a high-speed regional train system in South Korea.
In this context, GTX에 specifies the place where construction activities commenced.
GTX에 공사가 시작되었어요.
Construction has started at the GTX.
In this sentence, GTX에 designates the location where the action (boarding) takes place.
돌아 오는 길에 GTX에 탑승했어요.
On my way back, I boarded the GTX.
Here, GTX에 대해 translates to 'about GTX,' indicating the topic of discussion.