The Adriatic Type 2-6-4 Locomotive No. 2035 was based on the Pennsylvania Railroad’s Class K-4 Pacific locomotive. The prototype had a 4-6-2 wheel arrangement, however, Lionel’s version of this locomotive was a 2-6-4, which is why their version of this locomotive is classed as an "Adriatic Type." Lionel would not produce a 4-6-2 Pacific locomotive during the post-war years.

This locomotive was produced in 1950 and 1951, and it was equipped with Magne-traction that distinguished it from its predecessor, the No. 2025. It also shares the same die cast boiler casting as this engine along with the No. 675. It has a three position direction unit whose lever is adjustable from the top of the boiler and is located behind the smoke stack. Came with a No. 6466W early tender without the deck rails.