Executions were still public. Thomas Cook ran excursion trains to promising executions. 30,000 people watched the hanging of a notorious pair of murderers, in 1849, including Charles Dickens, who watched from the roof of a house overlooking the gallows. He then famously sent a letter to the Times, condemning public executions and their use as popular entertainment. It took another 20 years before hangings would be conducted within prison walls.