This headline from the BBC web site is not quite right, as the trains in question are not new but in fact some of the oldest in Britain, dating from 1976. Originally used for local services in London, they are being transferred for South Coast routes, including Brighton to Portsmouth, a ninety minute trip. The trains have no toilets, which is unacceptable but people will just have to accept it.
This is another one of the indications that Britain is turning into a third world country. At one time there were toilets on the stations, but these got vandalised and were closed. There were few complaints as there were toilets on the trains at that time. Putting toiletless trains on a ninety minute run is probably going to cause the train company more trouble than they bargained for as desperate passengers are going to use the gangways between the carriages to satisfy the call of nature.
These use of stock is stupid, because there are trains used on short journeys in the London area, with toilets which are locked permanently out of use. These are the class 456 sets, operated by Southern itself. A bit of judicious shuffling of the fleet would largely solve the problem. If it was not that the railways were so fragmented and new stock is of so many incompatible types, it would also have been possible to shuffle to units around so that trains with toilets, presently used on South West Trains services could be used on the Brighton to Portsmouth run. An alternative would be to transfer the Brighton to Portsmouth service from Southern to South-West trains, as they have more suitable stock.
Story on BBC web site