I hope to collect the following information:
- name of operator / route
- is there a USB charging socket / is there a 3-pin plug socket
- at every seat / only at tables / not in standard class
So that for any given rail journey I take in the UK, I can answer the question: "What kind of charger and/or seat booking do I need?"
(Duplicate of this question: Which EU/UK train companies provide plug sockets, which are free, and on which services?, but seven years later)