1. The London Underground was the … underground system in the world first 2. It is more than … years old. 140 3. There are more than … tube stations. 280 4. The shortest escalators on the system has … steps. 50 5. The Jubilee Line Extension was the most expensive railway line ever built. It cost … million per kilometer. $330 6. All the escalators do the equivalent of … round the world trips every week. two 7. The early escalators were made of … . wood 8. Tube carriages originally had …. windows. no 9. The designer of the tube map was only paid … guineas for his original job. five 10. The air in the underground is on average … hotter than the air on the surface. 10 C

L i n k i n g w o r d s .