Non-folding electric commuter scooters - policy?

During the rush hour London commute, Non-folding bicycles are not allowed on the train service. However there has been a rise in people bringing non- or only partially folding electric scooters on my regular commute. Whilst the green credentials I'm sure are admiral, the size of these scooters are a menace. Are these really permitted to be carried on peak services? 

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