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General information
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Description
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General criteria
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Status of development: in use |
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Diesel engines using common rail injection are available in the power classes needed for railway applications but are still rare in railway fleets. At DB AG, common rail engines are integrated into 400 old shunting locomotives as part of a re-engining programme. |
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Time horizon for broad application: 5 - 10 years |
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Given the long life-time of rail vehicles, diffusion of common rail engines into rolling stock will be slow. In addition, invitations for tender are usually functional, i.e. they only specify fuel consumption and emission limits but leave it to manufacturers to realise these targets. So in principle there is no bias for common rail technology on the part of railways. |
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Expected technological development: dynamic |
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cf. Application outside railway sector - Expected technological development outside railway sector |
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Motivation:
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- High power and torque
- Emission control
- Reduced noise emission
- Low fuel consumption
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Benefits (other than environmental): big |
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Power and torque
Especially at low speeds common rail systems yield higher engine torques than
conventional injection systems.
Noise
Reduced noise and vibration.
Reliability and engine life
Constant pressure supply in injection systems puts less stress on material
than conventional systems. This leads to longer engine life. |
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Barriers: low |
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(no details available) |
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Success factors:
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(no details available) |
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Applicability for railway segments: medium |
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Type of traction: diesel
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Type of transportation: passenger - main lines, passenger - regional lines, passenger - suburban lines, freight
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In principle, common rail technology can be used on diesel vehicles of all power classes. |
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Grade of diffusion into railway markets:
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Diffusion into relevant segment of fleet: < 5% |
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Share of newly purchased stock: (no data) |
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(no details available) |
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Market potential (railways): medium |
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Most railways do not plan to pull out of diesel traction in the next decades. So there will be a market for modern diesel technologies in power classes suited for railways even in long-term perspective. |
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Example:
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DB re-engining programme As a part of their re-engining programme German DB AG is currently replacing the engines of 400 old shunting locomotives by common rail engines. |
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Environmental criteria
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Impacts on energy efficiency:
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Energy efficiency potential for single vehicle: > 10% |
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Energy efficiency potential throughout fleet: 1 - 2% |
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According to manufacturer, the MTU 4000 common rail engine which is fitted for railway applications has a fuel consumption of 195 g/kWh, compared to values between 200 and 250 g/kWh for most diesel engines in service. Improvements in fuel economy to be obtained by common rail technology is highly dependent on point of reference. Automotive manufacturers claim 20% less fuel consumption compared to previous generation of engines (not specified). Compared to other state-of-the-art diesel solutions, improvements will be much smaller. In re-engining programmes for old locomotives, common rail technology may improve fuel economy by up to 30 % compared to 30 year old engines. |
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Other environmental impacts: positive |
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Reduced emission. |
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Economic criteria
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Application outside railway sector
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Overall rating
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