In second place is family firm B&M McHugh, with international consultant Mott MacDonald in third.
Osborne, which topped the table when it was published , is now fourth, although its score remains unchanged.
Some 40 companies are ranked by average delivery score using Network Rail’s PRISM performance improvement tool for all contract worth more than آ£50,000.
Propping up the bottom of the league table are Colas Rail Morgan Sindall JV and HVMS and, third from bottom, Amey UK.
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