premise: Finsbury Park TMD was a railway Traction Maintenance Depot situated in London, England. It was the first purpose built main line diesel locomotive depot opened in England and it was fully commissioned in April 1960. Finsbury Park was a steam shed under British Railways with the depot code 34G; the depot code of the diesel depot under BR was FP. The nearest railway station is Finsbury Park.
hypothesis: Other first purpose main line diesel locomotive depots were built after Finsbury Park.
reason: If it was the first built, then there must have been at least one more.