We have recently witnessed the emergence of a range of naturalistic studies concerned with work, interaction and technology in complex organisational environments. In this paper we examine a seemingly individual and isolated activity, which involves the use of relatively basic technology to guide a vehicle in accord with a highly regulated signalling system. The paper considers the ways in which operating a vehicle is systematically co-ordinated with the actions of others. These actions, whether by passengers or colleagues, are only ‘visible’ by virtue of various technologies; technologies that offer restricted and even distorted access to people and their conduct. In one sense, therefore, the essay is concerned with explicating the socially organised and interactionally sensitive ‘intelligence’ which features in the day-to-day work of drivers on London Underground; a rapid urban transport system which carries more than a million passengers a day.