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Malvern, Pa., is a small community located about 25 miles west of Philadelphia, but despite its size, the Borough faced big- city constraints on a recent railway station improvement project. The project involved constructing a pedestrian tunnel to Malvern Station underneath live railroad tracks.
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After 35 working days of excavation, Ohio contractor Turn Key Tunneling Inc. had reason to celebrate. Their trenchless crossing beneath Interstate Highway 265 in Louisville, KY, had just been completed at an unprecedented bore length of 352 feet.

Turn-Key Tunneling Inc. of Columbus, Ohio, recently redefined the limits of hard rock boring using a Robbins Small Boring Unit (SBU). The contractor used the SBU and auger boring machine (ABM) combination to bore a 470-ft long, line and grade sensitive crossing for a gravity sewer.