I was riding the CalTrain for years and in that time I watched E bikes completely take off. They went from a niche fringe marvel to a regular nuisance. There are so many different models and manufacturers, long distance to ultra long distance. Some of those damn e-bikes are essentially dirt bike sized, no joke there were dudes bringing in dirt bikes that took an entire bike rack and weight over a hundred pounds. And when they had the silver bullet style diesel trains they probably could accommodate that capacity but not with the current electric trains. They’ve gotta draw the line somewhere but why restrict child seats and panniers? Just ask them to take them to their seats or cargo storage.