Round-up: Shanghai metro crash, Singapore Circle Line, Beijing interchange

• Shanghaiist has a good round-up of news after the crash on Shanghai's Metro Line 10. Power failure and human error are said to have caused the crash.
• In Beijing, a new interchange passageway has shortened transfer times at the notoriously slow Xizhimen station
• Singapore's Circle Line will be extended, with the official opening on October 8. We'll blog about the changes to Explore Singapore later in the week.