"No-one was FORCED to board the train" is the usual line trotted out in these circumstances and/or those of extreme overcrowding - the normal desire/need of people to get home in the absence of any other means is generally overlooked, as would be the flat refusal of FGW▸ to meet the expenses of anyone who chose not to travel and booked into a hotel or sought other means of travel under the "consequential losses" catch all...............if you communicate effectively, regularly and honestly in a timely manner, managing people's expectations, then they can make an informed decision as to the best course of action. If you leave them in situations of uncertainty or concern, they will take the least worst option. Don't for one minute try to blame them for acting like humans.
We must remember here that the problems that caused these delays were down to the weather. If had been stuck on the M4 or M5 in a 5 hour traffic jam (I have been) then there is no question of Highways England offering you compensation. I don't think
GWR▸ or
NR» were negligent in this situation, but the railway does offer more by way of compensation than road transport. It sounds like the communications could have been improved - but then Highways England doesn't make any attempt to communicate with motorists when they are tuck for hours. So perhaps at least one out of ten for trying.