A new report from Transit Matters shows the top 10 slowest and top 10 most bunched routes
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The SL4, a Silver Line that travels between South and Nubian Stations, won the not-so-esteemed honor of slowest MBTA bus route, according to a new report.
Transit Matters, a Mass. transportation advocacy nonprofit, found the route traveled at an average speed of 6.09 mph in October 2025 — a trend of Boston’s slowest routes getting even slower…