Chou Tokkyuu Hikarian

Chou Tokkyuu Hikarian: Japan Hikarian Railroad (超特急ヒカリアン JAPAN HIKARIAN RAILROAD)

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)