Below find two pictures of legit Nos. 24856 and 24866 (that just happen to be on my train wall 
). The example combination submitted above is clearly a repaint, as one can note by the lettering, the curious blue overspray on the vestibule door, the overly wide yellow roof stripe that also obscures the thin line of blue above the stripe, and the presence of the nail holes on the simulated nameplate. The only car of the four that should have speed nail heads or the holes for them associated with the nameplate is the 24866 observation. All four set cars should have internal illumination, of course. The submitted sample of a 24866 above appears to be genuine. This is in agreement with the opinions offered by Rusty and Jerry above. Also, a pic of the two Eagle sets from 1958 is attached for reference.
Hope this helps.
Bob
