In the mid 2010s, construction began on the new Crossrail station, located south west of the main station building. Coinciding with this project, a new taxi rank and pick up point was built north of the main station, as well as comprehensive upgrades to Paddington tube station. The station had previously been criticised for very poor air quality inside the train shed, however this was improved with the replacement of diesel InterCity 125 trains by bi-mode Class 800 trains in the late 2010s.