Could I put forward my suggestion and try to use direct trains(if possible) and try not to use "small trains".
Thinking of the Bristol to manchester services where(to the best of my knowledge) are needing a change of trains at Birmingham.
Just keep away from two small trains bristol TM▸ to Newport and Newport to Manchester.
In the other direction just try and keep away from the local stopping train from BTM▸ to Taunton if your heading for the south west of england.
From a personal point of view I try and get in the first coach in the second class end,
of cross country trains which can prevent passengers having to walk past you, and return)
We have a huge variety of services and rules. So general wording that applies right across ... from Newquay to Newcastle, from Chetnole to Chester and even from Melksham to Sea Mills (a journey that Lisa and I have on hold for personal business) ... is a very blunt tool.
The banner across the top and the tick list are
GWR▸ official and the highlighted yellow text is what it means for Melksham passengers.
MRUG» has done that with a view to sorting out local specific issues without providing so much that it confuses occasional users. Others welcome to use the same approach.