A P2 train map is named after the class of locomotive designed by Sir Nigel Gresley. It is a train mapping system used in Britain’s mainline railways

British Rail

British Railways , which from 1965 traded as British Rail, was the operator of most of the rail transport in Great Britain between 1948 and 1997. It was formed from the nationalisation of the "Big Four" British railway companies and lasted until the gradual privatisation of British Rail, in stages...

 to assist with the visualisation of train movement data for monitoring purposes.

The P2 terminals which run on standard networked Windows

Microsoft Windows

Microsoft Windows is a series of operating systems produced by Microsoft.Microsoft introduced an operating environment named Windows on November 20, 1985 as an add-on to MS-DOS in response to the growing interest in graphical user interfaces . Microsoft Windows came to dominate the world's personal...

 PCs are used to show the position of individual trains which are assigned a four digit alphanumeric running code known as a Headcode or Train Reporting Code. As the train passes along the track, the position is automatically updated on the terminal. By clicking on an individual entry more detailed information about the train service is available. This includes reasons for late running, departure and destination information. The P2 system has been developed by SchlumbergerSema (now Atos Origin) to replace the older SIVS terminals train mapping system that has been in use since the mid 1980’s.