I would think that by 2040 that battery technology would have advanced enough that an electric/battery locomotive would be good for a couple of hundred miles on battery power alone.
In 2040, indoor data transmission might be done with IR or visible light (Li-Fi). One advantage would be somewhat better security. The "Sidecar" feature with MacOS 10.15 and above along with iOS 14 and above suggests that mobile computers may not need their own display, but make use of whatever display is handy. Another possibility is display integrated with glasses.
About six months after the request (from Overmod?) here it is.
https://blerfblog.blogspot.com/2020/12/annotated-2040.html
I tried to show (what I remember of) what I was thinking at the time, what I bothered to try to calculate, and what I just plain took a SWAG at.
Also, tries to take a peek at what's happened since w.r.t. specific predictions.
Reader assumes all risk!
-Don (Random stuff, mostly about trains - what else? http://blerfblog.blogspot.com/)
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