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If memory serves me correctly, Leicester Campbell Str was more-or-less on the site of the current station, and Welford Road only ever had a northbound platform, which brings us to...
I have spent some time going through my archives for a closed station with that name, without any success.
We travelled down the line of the London and Birmingham railway after we left Castlethorpe and passed some open stations until we reached the Bletchley area, where we will be able to then access the Varsity Line, this being the final line of this journey.