The engagement of the London Mayor follows a campaign by Scottish Transport Minister Keith Brown to sign up a "coalition of the eager" to support a cross-border route, which has so far been backed by 17 councils in the north of England.
BORIS Johnson has become the latest high-profile politician to express interest in the Scottish Government's aim to extend a high speed rail network north of the Border.
The engagement of the London Mayor follows a campaign by Scottish Transport Minister Keith Brown to sign up a "coalition of the eager" to support a cross-border route, which has so far been backed by 17 councils in the north of England.
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