Schweizerische Industrie Gesellschaft
The Bernina Railway (BB), which opened in 1908, originally procured a total of 17 electric railcars in two series from the manufacturers Schweizerische Industrie Gesellschaft (SIG) und Elektrizitätsgesellschaft Alioth. All of these railcars were later rebuilt as Rhaetian Railway ABe 4/4 I class railcars.