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General information
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Description
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In the second half of the 20th century diesel-electric and diesel-hydraulic stock has widely replaced older diesel stock with mechanical transmission. With advances in gear technology, some manufacturers and operators are recently starting to rediscover diesel-mechanic propulsion for reasons such as low price, low weight and high efficiency. Manufacturer |
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General criteria
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Status of development: in use |
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Time horizon for broad application: now |
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Expected technological development: dynamic |
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Benefits (other than environmental): big |
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Barriers: (no data) |
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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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Grade of diffusion into railway markets:
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Diffusion into relevant segment of fleet: 5 - 20% |
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Share of newly purchased stock: < 20% |
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Market potential (railways): medium |
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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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Other environmental impacts: neutral |
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Economic criteria
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Vehicle - fix costs: low |
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Diesel-mechanic transmission is roughly three times cheaper than hydro-mechanic transmission. |
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Vehicle - running costs: significant reduction |
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Compared to other transmission systems, mechanic transmission substantially reduces energy costs but increases maintenance costs. No figures are available, but it is expected that there is still an overall reduction running costs. |
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Infrastructure - fix costs: none |
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(no details available) |
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Infrastructure - running costs: unchanged |
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(no details available) |
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Scale effects: high |
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In many cases, scale effects can be exploited by using "off-the-shelf" solutions from automotive mass markets (busses and trucks). |
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Amortisation: (no data) |
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According to DSB, diesel-mechanic stock has equal or lower LCC than diesel-hydraulic stock. |
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Application outside railway sector
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Status of development outside railway sector: in use |
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Standard transmission technology in diesel cars, trucks and busses. |
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Time horizon for broad application outside railway sector: now |
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(no details available) |
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Expected technological development outside railway sector: dynamic |
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Diesel-mechanic transmission is an old and highly optimised technology. However, the last decades have shown that further progress is still possible. |
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Market potential outside railway sector: high |
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(no details available) |
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Overall rating
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Overall potential: promising |
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Time horizon: mid-term |
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State-of-the-art technology make diesel-mechanic propulsion an attractive alternative to diesel-electric or diesel-hydraulic propulsion. In many contexts, LCC are favourable. Energy efficiency advantages are very promising as well. However, potential for braking energy recovery is very limited. Nevertheless, in mid-term perspective diesel-mechanic stock is a highly promising option and should be seriously considered in diesel purchasing projects. |