Does the high-speed train from Chongqing to Chengdu depart from Chongqing or Chongqing North station?

I am travelling from London to Chengdu and noticed that the flights to Chongqing are much cheaper (often by several hundred pounds) than flights to Chengdu. I would like to fly to Chongqing and take the high-speed train to Chengdu instead. I have been trying to determine where the train starts from, for which I couldn't find much information online. It could be either Chongqing Station or Chongqing North Station. The only information I did find was on Wikipedia and seemed out of date:

• Chengdu–Chongqing intercity railway - says that the line opened initially to Chengdu North railway station until renovations are complete at Shapingba in 2016. We are now in 2018 so I guess this is out of date. The "Railway Stations" section doesn't make reference to Chongqing North, and the map underneath shows it connecting to both Chongqing and Chongqing North.
• Chongqing railway station - says that currently the station is closed for renovations until 2015, relating to work on the aforementioned line. Again this is up to 3 years out of date.
• Chongqing North railway station - does not make any mention of the high-speed line to Chengdu, although it does say that it is handling most long-distance traffic until 2015 - again out of date.

I am not solely focussed on Wikipedia but that is the only online source I have found so far. Can anyone provide a more accurate website for this information and/or let me know the information for where to take this line from? Also any information on the timetable, would also be helpful.