The Class 1100 locomotives of Nederlandse Spoorwegen were a class of 1,500 V DC Bo′Bo′ electric locomotives, introduced from 1950. They were built by Alsthom to an original design of the French BB 8100. They operated in the Netherlands. They have been out of service since 1999, although many were out of service before then. They operated all services, freight and passenger, and were the NS' main locomotive until the arrival of Class 1600s. They were extensively rebuilt between 1978 and 1982.