Case Studies

Case Studies


KiwiRail is New Zealand’s state-owned rail transport company. Headquartered in Wellington. KiwiRail is the largest rail transport operator, servicing approximately 4,000 kilometres of track and 198 mainline locomotives. There are 900 freight trains, 44 intercity passenger trains and 4,400 passenger services each week


As part of KiwiRail’s strategy for operational improvement, a decision was taken to deploy a driver advisory system to optimize energy efficiency and
schedule adherence. KiwiRail engaged TTG to initially evaluate the KiwiRail operations through a simulation analysis and series of Proof of Concept trials and subsequently, worked with TTG to provide a DAS solution for general freight and heavy haul rail operations. TTG were awarded a contract by KiwiRail in 2012 for the
rollout of TTG’s Driver Advisory System, Energymiser®, onto 170 locomotives.The Energymiser DAS system was integrated with existing timetabling and TSR systems as
well as wayside communications to remotely download application updates and upload data logs to server.


In 2016, KiwiRail received the “Large Energy User Initiative of the Year” category at the Deloitte Energy Excellence Awards for its commitment to fuel conservation. To quote KiwiRail’s Chief Executive Peter Reidy,

“Saving fuel in locomotive operations makes environmental and financial sense. The first full year of the initiative saw KiwiRail achieve fuel savings of 4 million litres of diesel, approximately 6 per cent of our fuel volume and avoid 10,800 tonnes of greenhouse gas emissions.”

The savings are a result of the Locomotive Fuel Conservation project, which included TTG’s Energymiser Driver Advisory System. The Energymiser system is operational on 170 diesel locomotives and on 3688 kms of track operated by KiwiRail.

The achievement is a significant milestone for KiwiRail and TTG, underscoring the commitment of both organisations in addressing climate change whilst conserving fuel. The achievement also emphasizes the positive working relationship between KiwiRail and TTG.


The SNCF (Société Nationale des Chemins de fer Français or “French National Railway Company”) is France’s national state-owned railway company. The SNCF operates the
country’s national rail services—for both passengers and freight— including the TGV, France’s intercity high-speed rail network.

The SNCF also direct the maintenance and signalling of rail infrastructure owned by Réseau Ferré de France (RFF).

The railway network consists of about 32,000 km of route, of which 1,800 km are high-speed lines and 14,500 km electrified. Around 14,000 trains operate daily.


On June 20, SNCF was named Company of the Year during the forum Energy Time —the annual gathering of decision makers in the field of energy — for its Opti-TGV highspeed train

Of the achievement, Director of Energy at SNCF, Olivier Menuet said, “It is a great pride for the teams of SNCF Voyages and the whole group.”

This project was born from innovative SNCF Voyages, and it’s success has now reached the Direction of Energy and Traction at SNCF level.


Opti-driving is a software program that saves energy by recommending to TGV drivers an ideal speed according to the geographical position of the train.

Firstly, the route of the line is recorded in the software. Next, this data is used to continuously calculate and recalculate the optimum train speed. This allows for
smooth acceleration and braking, and of course, a more seamless experience.

Olivier Menuet reinforces the functionality. “Agents already optimise driving in order to reduce energy expenditure, but the software makes it possible to go even further in this direction.”


Opti-Conduct aims to reduce the energy consumption of traction trains by 5 to 10%. The rationale behind this is two-pronged.

Firstly, it serves an ecological purpose, with lower energy expenditure logically diluting stress upon on the environment.

Secondly, it serves a financial purpose. Expenditure directly related to TGV trains is around € 200 million per year (on an overall energy budget of €1.3 billion per year for SNCF). This compares with €220 million per year spent by SNCF Voyages in the past.

There is also an important advantage in terms of maintenance and lifespan of high-speed trains, as braking and acceleration significantly affects the equipment (too much using cruise control affect the equipment, and giving a speed reference with opti conduite “allows to use less cruise control”)


Opti-Conduct was tested across 2016, and deployed since early 2017 and today, the software is used on all TGV axes. Elsewhere, intercity, Transilien, TER and Freight have expressed interest in adopting the system. The consensus seems firmly in favour of maximising the longevity of these trains and their associated equipment

Connecting the DAS is the next step. DAS is ready to be connected to the future traffic management system. First trials of a connected DAS will take place in 2019.

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