Additive manufacturing has evolved in the railway industry from an experimental technology to a strategic tool in spare parts supply. More and more maintenance companies, operators and manufacturers are turning to 3D printing to provide spare parts flexibly, quickly and in a resource-efficient manner. At Deutsche Bahn, for example, over 150,000 spare parts have already been additively manufactured.
Particularly in the case of older vehicles or rare components, the technology enables short-term production and avoids downtime that would otherwise result from long supply chains. This is fundamentally changing the supply of spare parts – and raises the question of whether the used parts market will lose importance in the future or benefit from this development.
Faster spare part availability through additive manufacturing
One key advantage of 3D printing in the railway industry is obvious: drastically reduced procurement times. Components that used to take weeks or months to deliver can now be produced within a few days – right where they are needed. This so-called on-demand production minimises dependence on suppliers and significantly reduces logistical costs. Maintenance workshops and service providers also benefit from the ability to manufacture rare or discontinued components themselves as needed. This creates a digital spare parts warehouse that replaces physical inventories and reduces downtime.
Benefits for sustainability and logistics
In addition to speed and flexibility, additive manufacturing also offers environmental benefits. Since spare parts are only manufactured when actually needed, there is no need for costly warehousing and long-distance transport. This not only reduces costs but also CO₂ emissions. Material use is also more efficient: instead of processing large quantities of raw materials, 3D printing uses only the material that is needed. The technology thus supports the sustainability goals of many railway companies and contributes to more environmentally friendly maintenance.
Impact on the used parts market
Despite the advantages of 3D printing, the used parts market in the railway industry remains highly relevant. For many components, there is still no digital design data or approved printing processes. Here in particular, the market for used railway parts remains an indispensable source, especially for older vehicles and specific assemblies. In addition, the used market can even benefit from additive manufacturing: used original parts often serve as templates for scanning and re-engineering before they can be digitised and reprinted in the future.
At the same time, the market is changing: while simpler components are increasingly being manufactured additively, complex or safety-relevant second-hand components retain their importance. In many cases, these parts come from surplus stock or decommissioned vehicles and offer a quick, economical solution for both sellers and buyers. This is particularly true in cases where 3D printing is not (yet) feasible due to a lack of data, approvals or economic factors. For this reason, the used market remains an indispensable part of the spare parts supply chain, even in an increasingly digitalised industry.
Conclusion
3D printing is not a direct competitor, but rather a technological complement to the used parts market. Both systems address different needs: the used market scores points for availability and originality, while additive manufacturing scores for flexibility and speed. Together, they form a hybrid supply system that ensures the long-term availability of spare parts in the railway industry. In the future, the key factor will be how closely the two areas are networked – for example, through digital platforms that link physical inventories and digital manufacturing data.
