In a major national boundary change in 1958 the former Great Central network except those lines in Yorkshire and Lincolnshire transferred to the London Midland Region; in return the Eastern gained the former LMS lines in Lincolnshire and the present-day South Yorkshire.
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After the merger with the North Eastern Region, that region's headquarters in York became the headquarters of the new Eastern Region.
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This was followed by ten 3-car sets comprising DMBS/TSL/DMCL for the NER at Bradford, then a further twenty 3-car sets.
While used in East Anglia, with locos allocated to Stratford and March depots, they were found throughout the Eastern Region of BR with Finsbury Park sporting a large allocation along with the depots at Tinsley, Immingham and Thornaby.