What are you talking about?

Batteries have planety of drawbacks compared to overhead wires.

• Weight - Batteries way a LOT, meaning that locomotives need to be stronger, meaning they will be heavier, meaning that need stronger bridges and sturdier tracks.
• Lifetime - Batteries are consumed as they are used and recharged, they are also not as easy/cheap to replace as pantographs.
• Range - Batteries has limited range, normal electric trains have unlimited range.
• Charge time - Batteries need charging, normal electric trains does not.

Normal electric trains are technically the ideal transportation, you have unlimited range and don’t need to carry the fuel.