With a slightly confused headline (rain trial???) the BBC spoke to Gareth Powell, London Underground's director of strategy, who said: "Given the technology now available it is very unlikely that London Underground will ever again buy a fleet of trains with conventional drivers' cabs.
"Safety will always be our top priority and we have made no secret that from the 2020s new trains could operate on the Tube without the need for traditional drivers."
The document was leaked by the RMT whose leader Bob Crow said "This is Boris Johnson's driverless and de-staffed plan for the future of
the Tube and it is a lethal combination of cash-led cuts and ignorance
that would leave Londoner's riding a daily death trap. The proposals seek to rip up every safety rule in
the book - having the trains run by remote control from signal boxes."
Unsurprisingly it wasn't long before he threatened strike action "RMT is demanding cast-iron
assurances that this whole poisonous cocktail of proposals has been
dumped for good and we will have no hesitation in taking the action
required to stop this."
A number of Conservatives have been lobbying for driverless trains for
some time and Tory Transport spokesman Richard Tracey called Bob Crow's
an "alarmist rant", saying: "Driverless trains are a fact in 25 cities
around the world and are perfectly safe"
LU's Gareth Powell stressed that consultation with staff would always take place before driverless trains were introduced: "We will always consult with staff on any changes and, because of the
timescales needed to develop and introduce new trains and to phase out
older fleets, we will continue to need drivers well beyond the point
when driverless operation could come into effect."
By the way, in case I've misunderstood the BBC's headline and they did mean "rain" - if Tube drivers can do anything to put a halt to the rain I'd welcome these trials.