Re: StLB&M flat car
Following is some history & other info. In August 1941 Missouri Pacific and subsidiary International-Great Northern (I-GN) each placed orders with Bethlehem Steel Co. (BSC) for 50 flat cars of 50-ton capacity & 50’-0” length. BSC assigned to order DF 45.
With the changing times & advent of the U.S. entry into second world war, production was increased to 100 MP cars & the 50 identical cars originally ordered by I-GN switched to another MoPac subsidiary St. Louis, Brownsville & Mexico. Delivery of the 150 flat cars occurred in June 1942, numbered MP 8100-8199 & StLB&M 8350-8399.
The cars of riveted construction came with fish-belly side sills, 15 stake pockets per side, 12” rolled-channel end sills, 2 3/4” x 7 1/4” x 9’-4” yellow pine wood flooring, Universal Multi-Power Drop Shaft hand brake, Apex defect card holder double truss spring plankless trucks, and cast iron wheels. Painted black with white stencils.
Starting around mid-1956 after Missouri Pacific had emerged from receivership, locomotives & rolling stock of MoPac subsidiaries I-GN, StLB&M & NOT&M had their reporting mark stencils changed to MP while retaining their original numbers.
In late 1960 a handful of the cars from both series received 3’-4” high bulkheads, 46’ inside length, for hauling aluminum ingots. Later conversions are out of scope for STMFC.
Photos I’m aware of include a 3/4BL BSC builder photo of MP 8140 in the 1943 & 1946 Car Builders’ Cyclopedia (page 197 & 194, respectively); Bob’s Photo - Col. Chet McCoid, StLB&M 8373 with lumber load on 5/21/56; Dick Kuelbs photo MP 8166 on 11/24/60 with lumber load.
Gene Semon has answered your question about HO models.