The reference for locomotives and railcars
Italian State Railway ALn 668
Italy | 1954 | 787 produced
668 3237 in March 2012 in Marsala
668 3237 in March 2012 in Marsala

Since the various existing types of railcars were not suitable for introduction in large numbers, a standard type was developed at the beginning of the 1950s. Experience from the narrow-gauge railcars of the RALn 60 type was applied here. To save costs, they received two commercially available truck engines, each driving one axle. The class 813 of the JŽ and the Y1 of the SJ were derived from the ALn 668.

787 vehicles were built between 1954 and 1981. They were created in several series, which had, among other things, different engines or different door placement. The railcars were usually used individually, but depending on the series they were also capable of multiple working. Specially developed control cars were rarely used because they were only approved for 90 km/h. The ALn 668 were only replaced by the Minuetto at the beginning of the 21st century.

VariantFiat 203SFiat 221HFiat 8217Breda D140S6h
ManufacturerFIAT, Breda
Axle config1A-A1 2'B'1A-A1 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length77 ft 2 3/4 in
Wheelbase49 ft 8 7/16 in57 ft 3 in58 ft 2 13/16 in58 ft 0 7/8 in
Fixed wheelbase7 ft 6 9/16 in8 ft 0 7/16 in8 ft 2 7/16 in
Empty weight70,548 lbs74,957 lbs81,571 lbs70,548 lbs
Adhesive weight37,919 lbs41,888 lbs39,683 lbs
Power sourcediesel-hydraulic
Top speed68 mph81 mph
EngineFiat 203SFiat 221HFiat 8217Breda D140S6h
Engine type2x 6-cyl. diese1
Engine output335 hp (250 kW)365 hp (272 kW)553 hp (412 kW)268 hp (200 kW)
Power Plant
Calculated Values
last changed: 04/2024

We use cookies to save the following settings:

  • selected navigation structure
  • selected language
  • preferred units
  • spelling of railway company names

If you refuse the use of cookies, the settings will only be retained for the current session and will be reset to the default values the next time you visit the site.

Display of units

Here you can set the desired unit system for the technical data.

  • Metric: Lengths in meters, weights in tonnes, and volumes in cubic meters
  • Imperial (UK): Lengths in feet/inches, weights in long tons and volumes in imperial gallons
  • Imperial (US): Lengths in feet/inches, weights in pounds, and volumes in US gallons
  • Individual: Depends on the country of origin of each locomotive
Operator names

Here you can set the display of railway company names.

  • Short: Abbreviation or short form of the name
  • Standard: commonly used name, partially translated to English
  • Complete: full name in local language