FS Track Inspection Car "Euclide".
This car was riding on 6 wheel trucks and had an observation window in the end as well as lookouts on the side. Near to the stripe at the other end is lettering which reads "INFRASTRUTTURA, Centro Diagnostico Nazionale, Geometria Binario" which I take to mean "Infrastructure, National Diagnostic Centre, Trackwork Geometry ".
Photo by Michael Taylor, Hamilton, Ontario, Canada. (michael@michaeltaylor.ca)
Website www.MichaelTaylor.ca