The series G18 locomotives are four-axle diesel-hydraulic locomotives. As well as for mainline service and thanks to their large range they are ideally suited to the transport of goods or track-laying machines over long distances. Used in double traction, the G 18 are easily capable of transporting track-laying machines with a dead weight of over 2,000 tonnes from one construction project to the next. They also have the latest soot particle filter and emit up to 40 percent less nitrogen oxide than a conventional diesel locomotive. They can therefore also be used inside tunnels. The G 18 also fulfils the European crash standard EN 15277, which protects vehicle occupants in case of collision through a reinforced rail vehicle body.