PGTR,
All horizontal motor F3's used this frame 1948-1955(carry over 1956). Lionel, like most manufactures use common parts that can be used on multiple applications - mechanically how the motor/s are arranged and horn placement attachment points varied on many models 2333, 2343/44/45, 2353/54/55/56, 2245. The 2245's are unique because they were the only single motor F3 to use this frame. Hope this helps!
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