@Don Baird posted:Any idea why Lionel used the same number on two locomotives?
The later version with rollers was a 2036 without MagneTraction due to wartime material shortages, and can be considered a "2026RR" a la 671RR & 726RR, which were 681 & 736 steamers also without MagneTraction due to wartime material shortages. The 1952 2025 can be considered as such as well, being a 2035 with MagneTraction deleted... "2025RR". Lionel never went that far to letter them as such.