Although the 22 km from Tardienta to Huesca (part of a branch from the Madrid to Barcelona high-speed line) has been reconstructed as mixed Iberic and standard gauge, in general the interface between the two gauges in Spain is dealt with by means of gauge-changing installations, which can adjust the gauge of appropriately designed wheelsets on the move.
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The initial locomotives (originally designated RENFE 1900) were single cab hood unit designs, built at General Motor's La Grange, Illinois factory, as an Iberian gauge variant of the EMD G16 locomotive type, using EMD 567 engines; the construction order was completed under license at the MACOSA factory in Spain, using the same components in a double cab design.