I was pointed to this at
https://off-the-ground.org/litter-on-a-train/ - from Dr Elaine Massung. Article looks recent but date not immediately obvious to me.
I have commuted by train from Chippenham over the past several years and, as a result, I have put together my own guide to train etiquette – the general stuff that I’m sure most regular train travellers inwardly grumble about as well ...
[snip]
Yet my obsession with litter has seen me start to take notice of the problem on board trains and at stations. For example, rubbish left behind on trays or seats is common. The result is that the seat is effectively out of action until someone (most likely train staff) removes the litter – people do not want to sit where there’s trash.
However, getting rid of litter on trains can be equally problematic: bins on trains are not fit for their current purpose. Have a sandwich carton, bottle of water, and a coffee cup? That’s one bin full. Nor are there any recycling facilities, despite the train companies themselves selling a wide variety of recyclable beverage containers.
[continues]