Transportation electrification is growing, but the available figures do not establish a single global spending boom or support a ranking of Thales Group, Bombardier Inc., Siemens AG, Continental AG and General Electric. The clearest quantified forecast is for the accessible rail market: an estimated average of €119.2 billion a year in 2021–2023, rising to a forecast €139.4 billion a year in 2027–2029. That is a rail-market measure, not a forecast for all transport electrification or for these five companies’ spending.
How large is the transportation electrification market?
There is no single market figure here that captures spending across electric cars, charging, rail infrastructure, aviation and shipping. The best quantified measure available is the accessible rail market reported by UNIFE’s World Rail Market Study 2024 and reproduced in Alstom’s Universal Registration Document 2025/26.
| Measure | Value | What it covers |
|---|---|---|
| Accessible rail market, annual average, 2021–2023 | €119.2 billion | Rail market including rolling stock, services, rail control, infrastructure, and turnkey or system integration, as reported by UNIFE and cited by Alstom. |
| Accessible rail market, annual average forecast, 2027–2029 | €139.4 billion | Forecast for the same accessible rail market, not a forecast of total transportation-electrification spending. |
| Average annual growth rate between the reported periods | 2.6% | UNIFE’s stated rate for the accessible rail market comparison, as cited by Alstom. |
These are market-size estimates for multiyear periods, not annual spending commitments by the named companies. They also include parts of the rail business that are not exclusively electrification. Treating the €139.4 billion figure as a forecast for the entire electrification market would therefore overstate what the source measures.
Why electric-car sales do not equal an electric transport system
The International Energy Agency’s report Electrification, published 22 September 2026, draws a useful distinction between new-vehicle sales and energy use across the whole transport system. Nearly 25% of new car sales in 2025 were electric, up from less than 1% in 2015. Yet electricity supplied nearly 2% of transport energy consumption in 2025, compared with 1% in 2015.
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Those figures describe different things. New-sales share measures the flow of vehicles sold in a year; transport-energy share reflects the much larger existing fleet and the energy used across transport modes. A rapidly growing share of electric-car sales does not mean that a similar share of all vehicles on the road—or all transport energy—is already electric.
The IEA also points to the difficulty of electrifying long-distance aviation and shipping. In EU policy context, the European Commission’s 2025 document COM/2025/664 says aviation and maritime together account for about 8.4% of total EU greenhouse gas emissions and can only marginally benefit from electrification. That figure is specific to the EU and emissions, not a global estimate of transport energy or investment.
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Where the five named companies fit—and what is established
The evidence supports looking at business roles and available disclosures, not ranking the five companies by electrification spending. A market forecast, a company’s order backlog, and capital spending are different measures: a backlog represents contracted work awaiting delivery, not money already spent or the size of the industry.
| Company named in the title | What the available evidence establishes |
|---|---|
| Siemens AG | Siemens Mobility sells rail electrification systems and related services. Siemens AG’s Annual Report 2025 says Mobility markets grew moderately in fiscal 2025 and describes demand for track electrification. Its €52 billion Mobility order backlog at fiscal year-end 2025 is contracted business, not a market-spending total or capital-expenditure figure. |
| Thales Group | No comparable current transportation-electrification spending figure or company investment plan is established in the sources cited here. |
| Bombardier Inc. | Do not treat Bombardier Transportation’s former rail business as a current, independent Bombardier Inc. transportation peer. Alstom’s FY 2024/25 Annual Results Management Report says the integration process for Bombardier Transportation had ended. |
| Continental AG | No comparable current transportation-electrification spending figure or company investment plan is established in the sources cited here. |
| General Electric | No comparable current transportation-electrification spending figure or company investment plan is established in the sources cited here. The name also needs clarification before making a company-level comparison: it may refer to a present corporate entity or to a legacy business. |
What Siemens Mobility sells in rail electrification
Siemens Mobility’s rail-electrification portfolio is infrastructure-scale rather than a consumer EV offering. Its published portfolio description includes AC and DC traction power supply, contact lines, network control, planning, project engineering, maintenance and service. Such projects connect power supply and railway operations, so the relevant commercial activity can span equipment, integration and long-term services.
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That portfolio makes Siemens a clear example of a company participating in rail electrification. It does not, by itself, show how much Siemens is investing, how much of its backlog is specifically electrification, or what share of the accessible rail market it will capture. The €52 billion backlog covers Siemens Mobility’s contracted business, not just electrification.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Why rail, road, aviation and shipping need separate comparisons
- Road vehicles: The IEA’s new-car sales share is a useful adoption indicator, but it is not the value of the EV market, infrastructure investment, or the electrified share of the vehicle fleet.
- Rail: The UNIFE figure covers a broad accessible rail market, including infrastructure and services as well as vehicles and control systems. It is the only quantified market forecast among the figures discussed here.
- Aviation and shipping: Long-distance operations are difficult to electrify directly. Low-carbon fuels and other decarbonization measures therefore matter alongside electrification; the EU policy figure cited above illustrates the emissions context in that region.
Combining these modes into a single spending total would require a consistent definition of electrification investment and comparable forecasts for each segment. The figures cited here do not provide that aggregation.
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How to read claims that spending will “boom”
When evaluating a market or company claim, first check what is being measured and over what period. Sales share, energy share, market size, order intake, backlog and capital expenditure answer different questions. For example, Alstom’s report also discusses railway manufacturers’ order intake; order intake represents bookings, not recognized revenue or capital expenditure.
- For a market-growth claim: Check whether it covers rail, road, or all transport, and whether its number is an estimate, forecast, or actual spending.
- For a company investment claim: Look for a current annual report or investor disclosure that identifies the relevant business, spending measure and period. A product portfolio or backlog alone does not establish investment spending.
- For a peer comparison: Confirm that the companies refer to current, comparable businesses. Historical units and corporate names can obscure changes in ownership or scope, as with Bombardier Transportation.
On the evidence available, the defensible conclusion is narrower than the headline premise: accessible rail-market growth is forecast, and electrification is advancing in road transport, but a sector-wide transportation-electrification spending boom and a five-company spending ranking are not established.
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