"Not just in London but across the country, more people are using the railway, which is helping to generate record levels of revenue to fund better services and improved stations for passengers."
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Acting Commissioner Craig Mackey led new policemen and women in paying their respects at a passing-out parade in Hendon, north-west London.
The tour of European capitals was timed to coincide with the start of the Article 50 process to exit the EU.
The Football League will introduce the project if the family of PC Keith Palmer supports the idea.