what does the word locomotive mean

When the UK government launched its Decarbonisation and energy efficiency roadmap 2050 project – working with the UK’s eight most energy intensive manufacturing industries, including glass – British Glass saw an opportunity to develop a new type of relationship with policy makers. William and the friend Jason bring their bicycles on the attic, shrink themselves, and embark on a journey. They meet Sir Simon because he is getting ready to leave for the tournament, and so they stop at his castle. They spend more time a boy plus a girl with the castle and together. The girl tells them of an omen her grandmother, Calendar, kept repeating before she died. Sir Simon sent Calendar away for the convent as he thought she was crazy and he does not believe the omen. Few accept it but Calendar's granddaughter does. Jason and William believe it too.