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| Renfe Class 252 | |
|---|---|
| Name | Renfe Class 252 |
| Type | Electric locomotive |
| Builder | Krauss-Maffei, CAF, GEC-Alsthom |
| Builddate | 1982–1988 |
| Totalproduction | 50 |
| Gauge | 1,668 mm (Iberian gauge) |
| Poweroutput | 4,600 kW |
| Electricsystem | 3,000 V DC |
| Collectionmethod | Pantograph |
| Operator | Renfe |
| Disposition | In service / withdrawn / preserved |
Renfe Class 252 is a class of Spanish electric locomotivees introduced in the 1980s for Renfe to modernize long-distance and freight traction on the Iberian Peninsula. Conceived during the period of Spanish industrial modernization under the auspices of multinational consortia, the class combined German, Spanish and British technology to supplant earlier RENFE types on premier services such as Talgo trains and heavier freight workings. The locomotives have served on routes linking Madrid, Barcelona, Valencia, and Seville and have been adapted over decades for evolving rolling stock and signalling environments like ETCS.
The 252 features a Bo′Bo′ wheel arrangement using UIC classification notation and runs on Iberian gauge track with a 3 kV DC overhead supply collected via pantographs. Its traction package comprises DC traction motors derived from GEC-Alsthom designs, controlled by thyristor choppers and later retrofitted with GTO and IGBT power electronics in some units to improve efficiency and compatibility with modern multiple-unit sets. The locomotive body integrates crashworthy cab structures influenced by UIC and EN standards and incorporates automatic couplers compatible with Talgo equipment and standard buffers for interoperability with RENFE coaching stock. Brake systems include rheostatic and compressed-air Westinghouse-type brakes interfacing with PZB-like legacy train protection and later ETCS level upgrades.
Development began following procurement studies involving Renfe technical staff, Krauss-Maffei, CAF, and GEC-Alsthom during the late 1970s and early 1980s, a period that included procurement discussions with Spanish Ministry of Transport and interaction with RENFE modernization plans linked to infrastructure works around Santiago de Compostela and Seville. Prototypes were constructed and tested on trial lines including corridors near Madrid Chamartín and Barcelona Sants before series manufacture between 1982 and 1988. Production involved Spanish factories in Beasain and German facilities in München, with components subcontracted from suppliers such as Siemens and Alstom affiliates.
Class 252 locomotives entered service on premier express services including Talgo-hauled trains between Madrid and Seville, regional express duties to Valencia and Alicante, and freight services on corridors serving ports such as Bilbao and Algeciras. They regularly hauled Civia-era coaches and intermodal freight across the Meseta Central and were rostered on international freight workings occasionally crossing into Portugal under bilateral agreements. Their operational deployment adapted with the opening of Madrid–Seville high-speed rail line and the introduction of AVE units, moving some 252s into secondary passenger duties and heavier freight services connecting to hubs like Zaragoza.
Throughout their service life, several 252s received modifications: installation of multiple-unit control systems compatible with Class 334 EMUs, retrofits for ETCS onboard units to comply with European Rail Traffic Management System mandates, and conversion of some units for dedicated heavy-freight service with enhanced cooling and reinforced gearboxes influenced by designs used in Class 269. A subset underwent auxiliary power changes to supply hotel power for push-pull Talgo rakes, while others were uprated for higher continuous tractive effort drawing on developments from MÁV and PKP electrified locomotive programs.
The class provides approximately 4,600 kW continuous power and a top service speed suited to mixed-traffic duties, balancing acceleration for passenger consists and tractive effort for freight tonnage on gradients such as those on the Pyrenees approaches. Safety systems installed included legacy ATP/PZB-type equipment and later ETCS onboard units to meet European Union interoperability directives and Directive 2008/57/EC technical standards, alongside energy-absorption features influenced by UIC crashworthiness research. Operational records reflect reliability improvements after traction-control upgrades and scheduled overhauls at Talleres de Zaragoza and Talleres de Valladolid.
Initial liveries combined Renfe corporate colors of the 1980s with white, blue and burgundy schemes used on Talgo-hauled expresses; subsequent repaints reflect Adif era branding and freight-oriented grey and orange liveries inspired by Renfe Mercancías schemes. Numbering follows Renfe class conventions with unit numbers in the 252xxx series allocated sequentially; preserved examples and withdrawn units sometimes bear historic registration plates from regional depots such as Atocha and Santa Perpètua.
With the arrival of newer Alstom Prima and Siemens Vectron locomotives and the expansion of high-speed rail services, several 252s have been withdrawn and earmarked for preservation by heritage groups at museums like the Museo del Ferrocarril (Madrid) and private preservation efforts near Vilanova i la Geltrú. Withdrawals have been phased, with some units cannibalized for spares to sustain active examples; others are retained as operational museum pieces used on charter workings connecting heritage events in Catalonia and Andalusia.
Category:Electric locomotives of Spain Category:Renfe locomotives Category:Bo′Bo′ locomotives