I was curious with the maintenance Sound Transit was doing the week before the pre-Thanksgiving snow storm, so I went for a field check. The Rider Alert said southbound platforms at Mount Baker and Beacon Hill would be closed, telling me the general area of work. I arrived at MLK and Walden around midnight, where there is a crossover for trains to switch tracks, and saw the red STOP sign and flasher on the southbound track indicating “men at work”. I saw no visible activity outside, suggesting the work was being done in the Beacon Hill tunnel. Later, someone commented on the blog that the work was about fixing leaks on the southbound platform of Beacon Hill Station.
Sound Transit spokesperson Bruce Gray confirmed to me that the work was indeed about fixing the leaky tunnel. The work is covered under warranty, which means the contractor, Obayashi, is responsible for the costs of fixing the defect. Beacon Hill Blog has photos and a report from September that quoted Gray saying such leakage is common in the first year for deep-mined projects. I visited Beacon Hill recently and saw the drainage system they installed in an attempt to collect the water and prevent it from dripping. It was still dripping though not as much as it used to. Fortunately, once this issue is resolved, Gray said “this should be the last of these maintenance delays during revenue hours for a long time.”
Past engineering and maintenance work on Central Link during revenue hours include noise reduction work with rail grinding in Rainier Valley and Tukwila, modifying crossovers on MLK to reduce noise, installation of track lubricators at Mount Baker and Tukwila; installing switch heaters by the Operations and Maintenance Facility to keep trains running during snow and ice conditions; and a weekend closure of the Downtown Seattle Transit Tunnel for upgrades and testing of the fire/life/safety systems.