The train story is silly I agree.
The bigger story was when she said she was travelling 'clean' so she took a yacht across the Atlantic. The only problem was that something like 4 crew members had to be flown over to NY so they could sail the yacht back.
LOL
But to be serious - of course there is something to say for young people taking an interest and trying to do something they perceive to be honourable and 'making a difference'.
I think the problem comes when you are then used as a political shield so that no one can argue with your ideology because you are the holy trinity of progressive politics (female, mentally a bit weird and a believer in climate change).
If anyone thinks that a 16 year old has suddenly formed their own opinion on a subject as complex as climate change, then they will want their heads read. Greta is clearly a victim of teachers and/or her parents who have only offered one side of the argument, and her mental conditions mean that she's become fixated on it.