Rigid-framed electric locomotive
Early type of electric locomotive
Rigid-framed electric locomotives were some of the first generations of electric locomotive design. When these began the traction motors of these early locomotives, particularly with AC motors, were too large and heavy to be mounted directly to the axles and so were carried on the frame. One of the initial simplest wheel arrangements for a mainline electric locomotive, from around 1900, was the 1′C1′ arrangement, in UIC classification.
Some of these locomotives had their driving wheels coupled with coupling rods, as for steam locomotives. Others had individual motors for each axle, as would later become universal.
By the middle of the century, the bogie arrangement for locomotives became more popular and rigid-framed locomotives are now rare, except for small shunters.
1′C1′
1′C1′ is the UIC classification for a railway locomotive with a wheel arrangement of three coupled driving wheels, with a leading and trailing articulated pony truck. The driving wheels are coupled by external coupling rods.
The description is most commonly applied to some locomotives from the early decades of electric locomotive design, when the traction motor or motors were mounted on a rigid frame and drove all the driving wheels coupled together. To permit higher speeds for fast passenger services, leading pony trucks were added.
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