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Trains are easy and they’re easily electrified already. So putting solar on the trains won’t have any advantage.
Rails are the difficult part of railways. They never seem to put them between my house and my work. They’ve put something called a road in between instead.
And 2 years of security updates.
They type of person who owns a set of wired headphones or earphones for over a decade doesn’t replace their phone every 2 years.
And these days you really shouldn’t try and keep a device on the internet without updates.
It’s why the fair phone got rightly trashed when they ditched the headphone jack. Battery powered ear buds were completely against their demographics
HMD make decent repairable phones with a headphone jack. They took the Nokia brand for a while but they’re now just HMD and they’re doing some cool modular stuff with cases too.