Bloomberg: Siemens, whose businesses include high-speed trains, medical equipment and power turbines, is seeking to provide electric-vehicle charging and components for automakers in the world’s biggest auto market. Photographer: Michele Tantussi/Bloomberg Siemens AG, Europe’s largest engineering company, said it is close to signing a contract to supply a Chinese city with electric-vehicle charging infrastructure. The company expects to complete a deal this month to provide customized charging posts for…