Ok, I know you’re knowledgeable, and know you probably do indeed have good sources, but you can’t spend an entire post picking apart my own without providing some of this “excessive,” and “20 years worth” of material. Otherwise it really just looks like proof by vehement assertion.
Sorry. I've been doing this long enough I usually can't even be bothered to get out the data for people on this one unless they're actual policymakers or are talking to policymakers; for them I will bother to dig out the studies. I'm sorry; it's a matter of impatience at this point. All these questions seemed reasonable to me 20 years ago, and 10 years ago, and now it just seems like people haven't bothered to Google.
Scotland's putting in battery-electrics, LIRR's putting in battery-electrics, Japan already has battery-electrics, Austria has battery-overhead wire hybrids.
Some deployments:
https://en.wikipedia.org/wiki/Battery_electric_multiple_unit
I will link a brief report from an advocacy group in the UK, which quotes a Scottish government report I haven't been able to track down yet:
The Scottish document compares energy efficiencies – fraction of grid energy “not wasted”. Energy is as physically
real as money. We must waste as little as possible. The percentage efficiencies are:
• electric trains (overhead wires) 83%
• battery trains 71%
• hydrogen trains 30%
If you pay close attention to the existing battery-electric deployments listed in Wikipedia, you'll notice that the effective ranges are increasing for each subsequent deployment. This has to do with batteries with higher volumetric and gravimetric energy density, and cheaper batteries. First it became commercially reasonable for 10-mile lines; now for 100-mile lines; it's going to keep going.
There just aren't any theoretical limits to battery-electric trains. The burden of proof is on those who are claiming that there's something wrong with them, not on me.
Range is determined by how many cars full of batteries you have, which is not limited. There are no issues with speed (I don't even know where you got that from).
Pricing, I can get citations on, and the pricing stuff is complicated as prices are moving all the time -- battery-electrics get cheaper yearly as battery prices drop, and used to be much too expensive to consider. My description of the cost situation should be considered a snapshot, as the price situation is very fast-moving. But I don't think that's what you were asserting. I get really annoyed by claims of non-feasibility, which are totally unfounded. Battery-electrics have always been completely feasible; due to massive drops in price, they are now also cost-effective much of the time.
There are a few critical technical developments from 10 years ago which you may not be aware of. Since Tesla started doing it, every manfuacturer now realizes that batteries must be thermally controlled -- kept in their happy temperature window. This is being done in the Wabtec and Progress Rail battery-electric locomotives, as well as in all new electric automobiles. This eliminates most of the unreliability and short-lifespan stories about batteries which you will have heard regarding batteries without thermal management.