Based on the information you provided so far, I believe your set was made by Lionel betwwen 1938 and 1942. The 1664 locomotive was paired up with the cars you have in many of the lower priced Lionel sets of that period. The 1664 was considered an 027 loco.
The more interesting part of what you have is probably the cars. These are the smaller sized (7-1/2") freight cars from the Lionel-Ives period. When the Ives company went bancrupt in 1928 Lionel and American Flyer controlled production of the Ives line of trains which were continued to be manufactured by the old Ives factory. In 1930 Lionel bought out American Flyers share and became sole owner of the Ives Line and Lionel moved production of the Ives trains to its own factory.
Lionel continued to produce an Ives line and catalog until 1933. Lionel continued to make the trains under a new low end line it called Lionel-Ives. The next year the line of trains was renamed Lionel Jr.
These cars (the Ives small series lithographed freight cars) were cataloged in the Ives catalogs in 1931 and 1932. In 1933 the cars were shown in the Lionel catalog as Lionel-Ives. In 1934 through 1936 they were cataloged as Lionel Jr. and from 1937 through 1942 they were cataloged as 027 cars.
The 1682 caboose in known to made in red with a brown roof in 1931 through 1934, solid red from 1933 through 1940 and dark brown in 1941 and 1942. Most cabooses were made with a single coupler. Ones with two couplers were generally sold with switcher engines.
The 1680 tank car was made in plain aluminum with no markings, aluminum with Sunoco and S.U.N.X. markings and in orange with Shell markings. Production from 1941 and 1942 had no handrails.
The 1679 Baby Ruth car came in yellow with a blue roof and in yellow with a maroon roof. Early versions had a picture of a candy car while later version had "Baby Ruth" in red letters and no candy bar.
The above information is from "Lionel A Collector's Guide and History to Lionel Trains, Volume I: Prewar O Gauge" by Tom McComas & James Tuohy, Copyright 1975.
I hope this iformation is helpful.