A very sharp, very lightly run (dummy units first unwrapped for photos & test trial),MTH RailKing Scale 30-2775-1 Illinois Central #2345 F-3 A-B-A with Proto-Sound 2 (3 volt) for O/027 gauge 3-Rail. M ade in 2007 and w orks great with Lionel, Williams, K-Line and other 3 rail O/027 gauge trains.