This is the group of three SIEMENS-BOCK insulators used for the Roma-Fiuggi railroad (3kV D.C.). They belong to the last series used here, are marked IMEC (Industria Milanese Elettro Ceramica) and date 1980. On the Roma-Fiuggi line are still remaining the same insulators marked FIP (Fabbrica Isolatori Porcellana), and older versions in brown and green glazed porcelain.

[IFONA U]