The Marston Vale line between Bedford and Bletchley is operated by London Midland units of various types. They operate services for a week before returning to Birmingham for servicing with some other units replacing them These swapovers take place on Sundays as seen here with 150109 and 153375 heading south as the 16.54 Tysley LMD to Bletchley CS 5B03 working. These two units will operate Marston Vale services for the coming week.
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