Can you find HK (and Shenzhen) in this poster of the world’s subway systems?

So, it turns out that all the subway systems in the world look a lot like a group of nefarious single-celled organisms when presented together. Maybe that’s what’s causing all this flu that's going around.
Subways of the world
By Time Out Hong Kong |
US artist and urban planner Neil Freeman made line drawings of all of the world’s 'high-capacity, grade-separated heavy rail' systems for a 29 by 23-inch black-and-white poster that will set you back a mere $310 (including shipping). 
Not only will the poster make a great HK-themed gift for someone on your list, but it also functions as an incredibly difficult game of “Where’s Wally's Subway Stop?” It took us a solid five minutes to identify the HK/Shenzhen subway, but see if you can do any better. 
Hint: The transit networks are organised from largest and most complicated to the simplest. Will Pulos