The 2379 Rio Grande F3 AB units of the later 1950s are yet another set of high quality F3 diesels produced by Lionel. Although the 2379 Rio Grande lacked some of the detailed exterior features of the earlier F3s, their durability was still top-of-the-line. As with most of the diesels from that era, when properly maintained, they will run as strong today as the day they were produced.