The SNCF Class X 4500 diesel multiple units were built by ANF between 1963-1970. The X4500 class are one of four classes of similar design (X4300, X4500, X4630, X4750) known as "Caravelles" as when built the engine sound reminded railwaymen of the contemporary French SE210 'Caravelle' jet airliner. X4500 are identical to the earlier Class X4300 except for having a different engine. The motor cars operate with unpowered trailers from either class XR8300 or XR8500 depending on seating demand. Most of the class has now been withdrawn. The last examples (14 as at April 2009) work around Burgundy (Nevers depot).