Negotiations about the line between the GCR and the Met took several years and in 1906 it was agreed that two tracks from Canfield Place to Harrow would be leased to the GCR for £20,000 a year and the Metropolitan and Great Central Joint Railway was created, leasing the line from Harrow to Verney Junction and the Brill branch for £44,000 a year, the GCR guaranteeing to place at least £45,000 of traffic on the line.
Forhandlinger om banen mellem GCR og Met tog adskillige år, og i 1906 blev det aftalt, at to spor fra Canfield Place til Harrow ville blive leaset til GCR for £20.000 om året, og Metropolitan and Great Central Joint Railway blev stiftet og leasede banen fra Harrow til Verney Junction og Brill-grenen for £44.000 om året, mens GCR garanterede trafik for mindst £45.000 på banen.