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Which private railway company in Tokyo runs the longest suburban trains?

Keikyu with 12 cars on their main line.. Red herring #1. The Odakyu Romance cars are considered an express service, not suburban, JR East is not a private railway company and Eidan/TOEI do not combine these sets.

The trains of which lines have the highest speeds? (Watch out for that pesky red herring!)

Keikyu Limited Expresses at 120km/h. Keikyu Limited are regularly used in express services between Yokohama & Shinagawa (the 600 & 2100 type sets are actually capable of 130km/h). The Chuo line 201 set's maximum speed is 100km/h. Keihin Tohoku line 209's maximum speed is 120km/h, but service speed is not normally that high. The 'New Red Arrow' belongs to Seibu, not Tobu.

Which line was the first to introduce 'Women Only' cars during late night services?

JR Saikyo. Keio was actually the first to provide this service, but is not on the list so is not a valid answer. Saikyo was the first JR line to do so.

Which line does not use trains with 6 door cars?

Joban. Sobu's E231, Yokohama's 205 and Keihin Tohoku's 209 sets all have this facility. All of these lines cars normally have 4 doors.

Which line has cars with 5 doors for quicker passenger entry/exit?

Tokyo Metro Hibiya. This subway line is approximately 20 kilometres long, and runs between Nakameguro and Kita-Senju.

Which two lines were connected (not physically - a change of platform is required) in December 2002?

JR Saikyo & JR Keiyo. When the extension of the Toyo Waterfront Railway (Rinkai line) was completed to Osaki, Saikyo line trains can run all the way through to Shin-Kiba, which is on the JR Keiyo line. JR Keihin Tohoku and JR Negishi are two names for the same line.

Which of these pairs of lines is not the same gauge?

Keikyu Daishi & Keio Inokashira. 1435mm and 1067mm respectively.

Which of these pairs of lines do not use the same voltage power supply?

Saitama Shin Kotsu (New Shuttle) & Yokohama Shin Kotsu (Kanazawa Seaside Line). Saitama Shin Kotsu runs on 600V, while the Yokohama Shin Kotsu uses 750V. Eidan Ginza subway and Tokyo Rinkai Shin Kotsu both use 600V, and the other four all use 1500V.

Which of these pairs of lines are connected for thru-running?

Odakyu Odawara & JR Joban. Keikyu does go to Narita Airport, but not on a JR line. The other pairs of lines do not connect.

Which line did not receive ex-Yamanote line 205 cars?

JR Chuo line. Refurbished 4 car sets are being made for the Sendai Senseki line, new 10 car sets are being repainted for JR Keiyo and 6 door cars are being added to current Saikyo line 205 sets.