A range of 300 miles a day is mentioned, with some charging during layovers. So why are battery trains so problematic today ?
Batteries have improved a lot since the 1950s, So a greater range, or the same range from a smaller and lighter battery should be achievable today.
It also mentioned partial recharging during the day, it mentions a top speed of 60 mph but not how long it took to get there!
The weight of the batteries must have been quite high even if the used NiCads.
There must have been good reasons why the use of batteries was not pursued