Electrical multiple unit testing: commissioning to overhaul

Throughout the service life of an Electrical Multiple Unit (EMU), the EMU shall undergo many varied electrical and mechanical testing regimes to ensure technical and functional compliance is maintained and therefore ensure safe and reliable operation. The initial stage of testing is known as commissioning and for Rolling Stock Manufacturers, the function of Commissioning is to ensure and maintain the critical link between production and the delivery of new rail vehicles to the customer. The first section of this paper shall therefore begin with a definition of the term “commissioning” followed by an overview of prevailing legislation that affects the introduction of new EMUs. Thereafter the introduction phases shall be discussed in more detail. The paper shall look at some of the issues and factors that can affect the handover of the new EMU to the Train Operator and then look at the role of the Commissioning Team. The second section of this paper shall then look at electrical testing beyond the commissioning phase and detail the rationale behind test clause breakdown with regards to routine and overhaul maintenance regimes.