These window panels being powder coated at EQC are for new underground trains as part of the Victoria Line Upgrade (VLU) project. The aims of the project are described in official documents as follows:

“The VLU project will provide passengers with safer, more reliable and quicker journeys as 47 new, more capacious trains will be brought onto the Victoria line between 2009 and 2013 and improved track, signalling and control systems will be put into place, allowing increased train frequency and faster journeys.”