The Beacon Hill Tunnel is about one mile long. Two separate
deep bores were made to
construct it, each one
carrying a single track along the somewhat curving route. The
tubes feature a station placed far under the modest commercial heart of
the namesake neighborhood.
At either end, the right of way emerges directly onto elevated structures.
The inbound train in this view is leaving West Portal, and will
shortly pass by the system's Operations and Maintenance facility,
located at street level.