Hong Mei

She is a Chinese tank engine who Thomas met in China that also happens to have the number 1 on her side.

Bio
Thomas first met Hong-Mei during his passenger run after saying he was the number 1 engine. However, Hong-Mei pointed out she was China’s number 1 engine, and the two had a race to see who’s the better number 1.

Unbeknownst to either engine, Hong-Mei spilled some of her delivery of rocks as she raced. This caused Thomas to derail on a shortcut line through the mountains. Hong-Mei came to Thomas’ rescue, revealing she took the shortcut line as well and made Thomas come off the rails with her carelessness. She pulled Thomas back onto the tracks and the two engines decided that two number 1 engines are just as good as one number 1 engine.