 The first sets built in 2007 (5001 to 5004) all had FS539 and FS039 bogies which had bolsters, but the sets built from 2008 had SS165F and SS026F bolsterless bogies.In the bogies with bolsters, the brake's leverage has been updated to increase the braking power to cope with increased ridership.The bogies attached to the control cars have their brake piping divided into two parts, and have been modified with anti-slip equipment.