Congrats on finding your set! It looks like you have set # 1291. Per Greenberg's, that was sold through Sears in 1972, and was not in the Lionel catalogue. Contents were:
8042 Pennsylvania loco, black, die-cast metal, smoke, headlight, no sound; 9062 Penn Central caboose; 9022 ATSF flatcar; 9141 BN gondola; 9012 TA&G hopper. This one did have the figure-8 track, too.
The ATSF flatcar can be found in both red and black.