Chou Tokkyuu Hikarian
Hikarian: Great Railroad Protector
Super Express Hikarian
超特急ヒカリアン
Chou Tokkyuu Hikarian is about a series of bullet trains that are turned into robots. The robots, along with two humans named Tetsuyuki Shinbashi and Minayo Kanda, have to stop an alien invasion.
(Source: Wikipedia)