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The secret of subway line 7. Today, let's take a look at the trains. If you've ridden line 7 often... you've probably ridden the center seat at least once. Are these seats comfortable or uncomfortable? Let's take a look at the features of these trains. 00:00 Intro 00:38 Feature 1: Is the operator manufacturing the trains? 02:30 Feature 2: The seats are in the middle of the trains? 07:08 So how many of them are in operation? #Line 7 #Center seat