The lattice structure style seen on the left also was employed along an approximately 60-mile transmission line built around 1906 between Leominster and western Massachusetts. Originally that line operated at 66kv and was insulated with Fred Locke multipart insulators (three or four-piece ones). The latter line was (and is) known as the A1-B1 Line and was upgraded and reconductored in later years by the New England Power Service to 69kv. All sorts of three and four-piece porcelain multiparts were used along the 60-mile stretch (mainly Lockes and OBs). The last of the original Fred Locke insulators was removed from service during an upgrade around 2010. An employee (also a collector) was able to save it. Almost all of the original towers on that line still stand, however with line posts. It is owned by National Grid. The only towers that were replaced were either on account of road construction or ice storms (the latter were very few and during the last 15 years).