Alright first of all Let s stop inventing nonsense out of the air And blatant lying have no place here either Remember that any controversial unsourced material will be challenged and removed as per WP Verifiability Now that everyone knows that we can hopefully start a sensible and reasonable discussion on Seoul again I will start with pointing out some very basic mistakes here The reference everyone seems to quote has no mention of this invented system called Seoul Subway Line 1 9 Strictly speaking it lists lines owned by Seoul City s government That reference also says that Line 7 extension to Incheon is to open by late 2012 which it did Since it is outdated the true number is 327 km Gyeongchun has no grade crossings Terra is still remembering the now passed away Gyeongchun line from the 80s and will never have KTX service which he is again confusing with Wongju Ganneung Line a separate line under construction exclusively for HSR Gyeongbu Line for the metro service of Line 1 operate on a separate track hence no track sharing Gyeongin Are you kidding me Freight and intercity trains Where is that nonsense coming from This is an exclusive metro line with no other traffic whatsoever This line is metro exclusive How old are you I mean like you seem to remember Seoul from the 80s or something Now I have addressed the issues above assuming that track sharing is not allowed which is an invented original research as raised by BsBsBs Looking back at the sources neither APTA nor USDT make any mention of that The 2011 UITP source does mention something similar to it in a footnote saying that networks that are functionally separate from the rest of the rail system are basically metros from what I understand Now remember they say functionally not track sharing That s because the Korean government s legal law defines Line 1 s Gyeongbu section for example as a metro because it has a dedicated track on its own that follow the same path as the intercity trains next to it In other words it is functionally separate from the rest of the railway system and hence meets UITP s definition which is very Eurocentric by the way Seoul Metro and SMRT are members of UITP so clearly track sharing is absent from their definitions But functionally separate is present And this is exactly how things should be done And this 10 minute rule is completely absent anywhere in UITP APTA or USDT and was voted out by consensus by multiple users except IJBall Legally Incheon Subway is part of the metro system so there s no doubt in including that as I have mentioned before with the legal sources From what I know Korail will be completely updating their website on April 1st with the new updated data for their subways So we will have direct numbers for all of Korail s metros pretty soon The issue of sorting metros by systems and not by operators is something that is not agreed with here It would require a name change on this article This will need external consensus and is something we will deal at a later time