SNCF metal box <STM> (Signalling - Telephony - Multiples) on a concrete post. This box can be used, for example, near a signal. It may contain a relay, bars or fuses, diodes, etc.), in this case it is used to make the connection between the overhead line (telephony) and one or more cables protected by fuses. FBX/PBR Phiphitrainz 2022 3d object made from documents by Georges Pinthon.