permanent. After the full system relaunched on April 2, 2014, it grew to 140 stations and over 1,300 bikes. On December 4, 2014, Hubway's non-management employees voted 23–8, 74%, in favor of joining Transport Workers Union of America (TWU) Local 100. The unionization effort came after employees of CitiBike in NYC, owned by the same parent company Motivate (formerly named Alta Bicycle Share), joined TWU Local 100 in September 2014 and was closely followed by similar efforts by employees of Alta Bicycle Share in Washington, D.C. and Chicago. Full system operations for 2014 concluded on November 26, though the system expanded its winter operations. For the second year, almost all Cambridge-based stations remained open year-round, and those stations were joined by 62 Boston-based stations that remained open through December 31, 2014. Inclement weather pushed back the full system reopening until April 17, 2015, and during the 2015 season the system grew to 155 stations and over 1,500 bicycles. In 2015, regular season operations concluded on November 25, though again Hubway expanded its winter operations further, with 110 stations remaining open through December 7, 2015; of those, 107 stayed open through December 31; and of those, the 37 Cambridge-based stations once again remain open year-round. In May 2017, Boston Mayor Marty Walsh announced a planned two-year expansion, adding 70 new stations and offering year-round service. As of 2017, Boston was ranked as the city with the fifth largest bike sharing system in the United States, after New York City, Chicago, Washington D.C., and Minneapolis. The rankings are determined by the number of hubs or stations. At that time, Boston had 184 stations. Re-branding to Bluebikes On March 7, 2018, Hubway announced a six-year partnership with Blue Cross Blue Shield of Massachusetts, which included a system-wide rebranding as Bluebikes, an expansion of 3,000 total bikes, and an addition of over 100 new stations by the end of 2019. Prior to this partnership, the Boston portion of the system had been sponsored by Boston-based athletic company New Balance. The new sponsorship with Blue Cross covers all four municipalities. The name change took effect on May 9, 2018, with the release of new and re-branded bicycles. On June 4, 2019, Bluebikes set a single-day ridership record with users taking 10,035 trips, the first time the ride-share has ever exceeded the 10,000-rider mark for a single day. On September 19, 2019 Bluebikes passed 10 million