History: “ The Prairie Type 2-6-2 Locomotive No. 2025 was based on the Pennsylvania Railroad’s Class K-4 Pacific locomotive. However, Lionel left off one of the leading truck axles that was on the prototype, which is why their version of this locomotive is classed as a "Prairie." Lionel would not produce a 4-6-2 Pacific locomotive during the post-war years.

"This locomotive did not have Magnetraction and early versions of this locomotive came with "Baldwin Discs" that had nickel rims for the driving wheels. These wheels have the "Baldwin" name embossed on them. It has a three-position direction unit whose lever is adjustable from the top of the boiler and is located behind the smoke stack. All of the early issues had a No. 2466WX or No. 6466WX tender that had rear deck handrails and staple-end trucks with an electric or magnetic coupler and a whistle. Although the four-digit number of this engine designates it for use with O27 Gauge track, it will also run on O radius curves. This locomotive is exactly the same as the No. 675 that Lionel sold with their O Gauge sets.

Variation A: The "2025" number is rubber-stamped on the boiler front keystone in SILVER. Note that this variation is often found with this number worn off. Unpainted aluminum smoke stack and came with a No. 2466WX tender that is rubber-stamped "LIONEL LINES." (1947)

Variation B: Identical to Variation A except the "2025" number is heat-stamped on the boiler front keystone. (1947)

Variation C: Identical to Variation A except has a RED and GOLD keystone decal on the boiler front that is numbered "5690". (1947)”  Notes from Tandem Associates.com

I have identified this locomotive as Variation C