Union Pacific and rail union members are suing each other in court over how the company should implement a COVID-19 vaccine mandate for its 31,000 employees. Union Pacific’s unions argue that the railroad giant needed to first negotiate with them before it announced earlier this month it would require all its workers to get the vaccine. In a lawsuit of its own, filed last week, Union Pacific said that it has the authority to mandate the shots. The railroad said that it would mandate all its workers to get the vaccine by Dec. 8 to comply with President Joe Biden’s Sept. 9 announcement requiring all federal contractors to get the vaccine. Meanwhile, it is simultaneously offering $300 bonuses if employees get the vaccine. “This action is necessary to prevent any disruption of the national rail network and to avoid any impact on America’s supply chain, as it continues to recover …