Powerline technology is strongly used in home application to extend an Ethernet network using already existing power cables. This cost-effective and reliable solution implements audio and video multimedia services and intranet connectivity.
Ethernet is nowadays the standard for coach and train communication defined in IEC 61375-2-5 (ETB) and IEC 61375-3-4 (ECN).
For Ethernet train coupling Powerline communication is a true alternative solution against wireless or standard Ethernet cables and connectors on refurbished and new trains.

Integrating Powerline technology in Passenger Information System devices allows to provide new services to comply with new passenger needing or new security circulation rules. A real case of a Passenger Emergency Intercom subsystem with Passenger Intercom Units and Train Driver Handsets with integrated Powerline modules is presented. 
This paper describes as well some applications on high speed and regional fleets and identifies some standard topologies for Point-to-Point train coupling and Bus PIS services.
Special focus is placed on analysis of standard railway existing cables, connectors and train couplers to carry out and identify maximum communication data rate (Mbps) in different scenarios of train length and number of coaches. In addition to the hardware part the software part with network OSI model layers is described and different implementations are suggested.
The aim is to show the benefit of Powerline solution on rolling stock applications and provide also it’s compliance to railway standards.