EV in train can refer to different things depending on the context. Here are some possible meanings:

• Effort Value (EV) Training: In the context of Pokémon games, EV stands for Effort Value, which is a value that determines how much a Pokémons stats will increase when it levels up. EV training refers to the process of defeating specific Pokémon to gain Effort Values for your Pokémon.

• Electric Vehicle (EV) Train: An EV train is a train that runs on electricity instead of diesel fuel. For example, the EV-E801 series is a two-car battery electric multiple unit (BEMU) train type operated by East Japan Railway Company (JR East) on the Oga Line in Akita Prefecture in northern Japan.

Without more context, it is difficult to determine which of these meanings is relevant to your question.