London Liverpool street lighting upgrade
http://www.railwaygazette.com/news/technology/single-view/view/london-liverpool-street-lighting-upgrade.html
To contribute to environment, it's one of the easy ways for railway companies to replace older items in each station with newer ones.
In major stations, you can find many items that consume energy.
For example, lighting, electric signage, air conditioning, escalators, and, elevators would be included in them.
