Oh, and.

>Great Western Railway battery train sets new world distance record of 200 miles to celebrate Railway 200 in style
>https://railuk.com/rail-news/great-western-railway-battery-train-sets-new-world-distance-record-of-200-miles-to-celebrate-railway-200-in-style/

Not much to add. Obviously catenary is the grand ideal, but, for arse-end-of-nowhere branch lines with a two-car 40-year-old DMU currently puttering back and forth all day every day, swapping in a battery pack is the obvious stopgap.