This is a topic particularly interesting to me. I recently purchased an e-scooter with the intention of using it as transport for the often missing "last mile" (or 3 miles in my case) part of my commute when I start with my local TOC in a few weeks.
I understand the legal position (which I believe is ludicrous and only not resolved as the gov't haven't figured out how to tax it yet) and the very mixed opinions on their use, so thought I could put forward my case for comment.....
Obviously, as a rail employee there is the option for free use of trains within my TOCs network. So, it makes sense that instead of commuting 17miles by car along one of the worst parts of the M4 for heavy, polluting traffic that I use the train. My local station is 3 miles via cycle path from the house and is literally door to station door and takes 14mins on the scooter. The alternative to this 3 mile cycle path trip is a 5 mile drive through town, mostly at very low speed with a lot of idling at traffic lights etc. and parking at the end costs £10/day.
I also own an e-bike, which is perfectly legal to use on the cycle path but comes with it's own issues, mainly it's size and there is no way I'm leaving a £3k bike locked up at a train station in plain view, it would be gone in minutes. The alternative may be a cheapo bike, but then you're into the realms of getting sweaty etc. which I just don't want before work. It's was OK for my last job where there were showers in work, but no good if your role doesn't allow for this.
There is also the bus option. I have a stop 20yds from the house but the bus takes 40mins and stops at the central bus station on the opposite side of town to the train station. Furthermore, the bus times and train times do not marry up, resulting in a total journey time of nearly 90mins due to waiting.
So to summarise the options.....
1. Drive the car, takes 16mins, burns fuel, pollutes and costs £10/day to park. Total journey time to work circa. 35mins.
2. Take the bus and suffer a total journey time of 90mins. Costs £4/day.
3. Use e-scooter to get to station in 14mins and then free train. Total journey time approx. 30 mins. Costs £0 (apart from electric to charge at home which is pennies).
So perhaps you can see why I made the decision to buy a scooter. The bigger issue I believe is the standard of scooters being sold and the people who ride them.
There are hundreds of cheap scooters available from the far east with very questionable QA and build quality. These sorts of goods manufacturers are known not to develop products properly and treat the customer as QA. It is not uncommon in China for goods to be returned 3 times as faulty with customers happy to accept replacement. Sadly, this trend seems to be spreading to the West. It is these scooters I believe that are more likely to spontaneously combust than the type I have purchased, which is from a British brand with waterproofed sealed electrics installed to higher standards.
Even more of a problem is the people that ride them. It's like any mode of transport - a car/motorbike/train/scooter or whatever is not dangerous in it's own right, it is the operator that is dangerous. For context, when approaching pedestrians on the cycle path I slow to walking pace to pass on the scooter. On a few occasions I have dismounted and pushed past elderly pedestrians that seemed intimidated. On one such occasion where I slowed to walking pace and gave a wide berth, a cyclist came between myself and the pedestrian at full tilt and scared the life out of the pedestrian!
Having researched my TOCs terms and conditions, there is no mention of e-scooters specifically but maximum dimensions are stated for mobility scooters which the e-scooter obviously fits within, especially when folded. I also have a bag with a shoulder strap to carry it which is about the size of a large duffle bag and have no intention of charging onboard, so nobody would be any the wiser as to the carriage of my scooter. Furthermore, if mobility scooters are allowed on trains, batteries and all, then what's the difference? They likely use the same modern lithium technology.
It is for these reasons I hope my TOC does not ban e-scooters and why I believe cased based banning seems to be the current approach.