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S-470 electric rail car

The 470 train unit is a vehicle that arose from remodelling of the 440 series. The 255 units of the 440 series were built between 1974 and 1985 by CAF, Westinghouse, General Electric (Bombardier), Macosa (Alstom) and the Japanese manufacturer Mitsubishi, which contributed the license for the electrical equipment and supplied the static regulation equipment based on thyristors (the two chopper units of the 501 and 502 units). These units comprise Renfe's most numerous self-propelled train series, which has also travelled the greatest number of kilometres.

The remodelling of the 440 series, which then formed a part of the 470 series, took place starting in 1993 at Renfe's Central Shops in Valladolid and Málaga, and it affected both the interior and exterior, thereby building a new generation of substantially different and improved vehicles with respect to the previous generation.

The most important change in this operation was the outfitting of air conditioning and a new interior design, in which the vestibule walls were eliminated to thus create a single lounge per car, with an open-space design, and in which the van was eliminated in those units that still had one. Moreover, the front end was replaced by a single-piece end wall with greater visibility, therefore eliminating the interconnecting door. One of the WCs was also eliminated, with only two remaining. From a technical point of view, the most important novelty of the 470 with respect to the 440 was the installation of a 100-kVA static converter for the air conditioning and the installation of a vacuum WC. Moreover, and even though the original generator unit was kept, it was equipped with a 30-kVA autotransformer (380/220 V) in the trailer with a cab, which allowed powering the service network with 220 V from the static converter in the event of a failure.

Initially, 56 units of the 440 series were converted to the 470 series, with another unit re-numbered as a 470 in 2003, so there are a total of 57 units in the series.



The body is self-supporting, and it is built with a welded steel structure on a steel frame. The basic composition is formed by three cars, one power car with a driver's cab, an intermediate trailer car and a third trailer car with a driver's cab. Up to four units, or twelve cars, can operate in a multiple composition. Each car has two vestibules for passenger entry, which are equipped with electro-pneumatically operated doors of two leafs to provide 1500 mm of clearance.

The vehicles are coupled to each other using Schafenberg automatic couplers on the cab side, which are mechanical, electrical and pneumatic, while the coupler is the semi-permanent type between cars, in which the coupling is only mechanical. The front door was eliminated from the new head end, and two thermal windscreens were installed, of tempered glass and laminated with polyvinyl. Likewise, strip-type side glazing was installed along the length of the vehicle.

Traction and auxiliary systems

Propulsion is provided by four, direct-current electric motors that drive the axles of the two bogies on the power car. Each motor is a series wound motor, with four main poles, commutating poles and a cylindrical frame of rolled steel, and they are self-ventilating. The continuous power of each motor is 290 kW. The electric power supply from the catenary is direct current at 3 kV through one of the two pantographs located on the power car. Control is provided by cam switches that short circuit the starting or braking resistors. The motors can be connected in series or parallel.

Current for the auxiliary equipment (lighting, traction control, heating, etc.) is generated through a generator unit located under the trailer car with a cab. A 100-kVA static converter has also been installed in the intermediate trailer car for powering the air conditioning and the vacuum WC, and it also feeds an autotransformer (380/220 V) if it is necessary to power the original services from the static converter.

Climate control is based on three-phase, 380 VAC, 50 Hz air conditioning, except for the original heating elements in the floor of the lounge and of the cab.

Bogies and brakes

The automatic braking system is the Knorr type, with air production coming from a W-type, 160/220-l compressor, driven by an 8.5-kW electric motor at 1800 rpm, and it also includes a drying system. Air is stored in two tanks provided for this purpose, and it is used for the pneumatic service brake, the emergency brake, the deadman, the pneumatic suspension, for opening the doors and for auxiliary services.

The unit has a pneumatic brake, a dynamic brake (rheostatic), electromagnetic plates and a parking brake (hydro-mechanical, screw-driven).

The pneumatic brake is the Kbr XI-E type. Brake control is electronic through three cables that run the length of the unit and that provide seven degrees of braking using a power supply code.

All the bogies incorporate four disk brakes, which are installed on the wheels of the motor bogies and on the axles of the trailer bogies.

There are two brake cylinders on each bogie, and they all have electro-pneumat.

Weights and Dimensions

  • Total train length: 79,590 mm.
  • Power car length: 26,205 mm.
  • Ri car length: 26,160 mm.
  • Rc car length: 26,205 mm.
  • Width of the body: 2900 mm.
  • Motor car height: 4260 mm.
  • Ri and Rc car height: 3682 mm.
  • Height of the floor above the track: 1028 mm.
  • Mass of train at maximum load: 204.917 t.
  • Unladen mass of train: 156 t.
  • Power car mass: 66 t.
  • Ri car mass: 43 t.
  • Rc car mass: 47 t.
  • Motor bogie mass: 13.5 t.
  • Carrying bogie mass: 8.25 t.

Pesos y Dimensiones

  • Longitud total del tren : 79.590 mm.
  • Longitud coche motor : 26.205 mm.
  • Longitud coche Ri : 26.160 mm.
  • Longitud coche Rc : 26.205 mm.
  • Anchura de caja : 2.900 mm.
  • Altura coche motor : 4.260 mm.
  • Altura coche Ri y RC : 3.682 mm.
  • Altura del piso sobre carril : 1.028 mm.
  • Masa del tren carga máxima : 204,917 t.
  • Masa del tren en vacío : 156 t.
  • Masa coche motor : 66 t.
  • Masa coche Ri : 43 t.
  • Masa coche Rc : 47 t.
  • Masa bogie motor : 13,5 t.
  • Masa bogie portador : 8,25 t.

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