TfL report reveals the cost and challenges of introducing driverless tube trains

The cost of upgrading the three of the London Underground lines to driverless trains would cost at least £20 billion, for just three of the oldest lines.The figure was revealed in a recent Mayor of London answer, and more details about how the number was obtained are available in a report by Transport for London (TfL) on the costs and implications of driverless trains.
Although previous studies have examined how driverless trains could be introduced on the London Underground, the latest re