Schweizerische Industrie Gesellschaft
The interurban line to Boudry always had a separate fleet from the urban fleet, but one small group of trams began service on the urban system and later moved to the interurban line after closure of the last urban line (3). These were cars 81–83, built in 1947 by Schweizerische Industrie Gesellschaft (SIG) and purchased new by TN. These four-axle cars were the only double-ended (bi-directional) Swiss Standard trams ever built. They were originally purchased for use on line 1, but were later used on line 3.