the 21st century St Pancras International was restored over a three year period at a cost of 800 million.The basement area is now the check-in and departure lounge. Escalators lead to the platforms on the floor above.the glass roof has been carefully restored, and the iron arches painted the original sky blue. An 18-car Eurostar train is about a quarter of a mile long, so the roof was extended. there are now fifteen platforms.