Most freight trains are diesel. Electric trains are usually passenger lines in dense areas. Also, this is direct electrification, so they just use the grid. But

Most freight trains are diesel. Electric trains are usually passenger lines in dense areas. Also, this is direct electrification, so they just use the grid. But batteries imply another separate infrastructure on top of that. If batteries could power everything, then this might be acceptable. But they can't, so we are left with chemical fuels again. So we are supposedly forced to simultaneously invest trillions into batteries and trillions more into green chemical fuels. That is highly infeasible and unlikely to happen. Redundancy is best solved with chemical fuels. This is because you can store them for long periods of time. So if this is a major factor, it will shift heavily towards that direction. And green fuels can be made with just renewable energy plus some common material. In hydrogen's case, this is just water. Synthetic fuels need some kind of green CO₂ source, which is doable if it can be pulled from the air somehow. So this already is protected from oil prices.