One thing to keep in mind; there is more than one group of locomotives that contain the 675-2025 numbers.
The 675 and 2025 locomotives built from 1947 to 1949 had a 2-6-2 wheel arrangement...these locomotives also had nickel-rimmed drivers and did not have magnetraction....
These locomotives were replaced in 1950 and 1951 by the 2035 locomotive with a 2-6-4 wheel arrangement... the 2035 featured magnetraction, and did not have the nickel-rimmed drivers, but had a boiler shell with the belpaire firebox, simular in appearance and size to the earlier 675-2025.
In 1952, due to the Korean War effort, there was a shortage of magnetic material, which was needed by the military.
So, Lionel could not build the magnetraction equipped 2035....
As a compromise, Lionel built this newer 2-6-4 locomotive without magnetraction and numbered them 675 and 2025 for 1952 production.
sadly, 1952 was the last year these beautiful monsters were produced.