Unlike the space centers on the mainland whose rail tracks are too narrow to transport the new five meter core boosters, Wenchang uses its sea port for deliveries. Initial launches of the CZ-5 booster from Wenchang were, as of early 2008, expected in 2014, one year after the intended commissioning of the Wenchang Launch Site. The first launch of CZ-5 was later shifted to 2016, and took place on 3 November 2016. The CZ-5B (max payload to LEO) variant was expected to fly around 2018 but the maiden flight took place 5 May 2020. A CZ-5 carrier rocket was already shipped from North China's Tianjin port at 20 September 2015 for a rehearsal (some drills carried out on the launch pad that involves both the carrier rocket and a probe) of a scheduled Chang'e-5 lunar mission, which was planned for around 2019. Chang'e 5 was successfully launched on 23 November 2020.