In this task, you will be shown a passage. You need to write a fill-in-the-gap question based on your understanding of the events that might be inferred from the passage. Your question should be answerable based on the passage and only have one correct answer. Show the gap in your question with a _ .

(CNN) December 2017 marks one year before Elizabeth Line trains start to whisk commuters under London's streets. But the line is already having an impact on the London property market -- triggering a spike in house prices near the stations, slashing commute times and opening new residential areas for commuters. Royal Purple The $20 billion Elizabeth Line -- called Crossrail while it's still under construction -- will be named in honor of the UK's Queen Elizabeth II. It will add a rather regal shade of purple to the red, yellow, green and blue-colored lines on London's famous Tube map, and a much-needed 10% expansion to central London's transport capacity.The Elizabeth Line will open in December 2018.Brexit uncertainty has resulted in a 2% drop in house prices.House prices near Crossrail stations grew by 39% in three years.
Although it's not yet open, the _ has already led to significant "Crossrail effects" on London property.