"Rolling Stock: S stock". Transport for London. Hentet 10. januar 2012. Note: The table erroneously says "Length per car", instead of "Length per train".
"Our Upgrade Plan"(PDF). Transport for London. februar 2011. Hentet 7. december 2012.
"Hammersmith to Edgware Road Circle line timetable". Transport for London. Hentet 9. december 2012. In the Tube timetable - Tube station box select "Hammersmith (H&C Line)" and press Get Timetable. Select Edgware Road timetable and then view timetable.