The Operating Log Unloading Car No. 3361 was produced on a GRAY plastic body, the "LIONEL LINES" lettering and car reporting data was rubber-stamped on. This car was produced from 1955 until 1959, and came with five stained logs, bar-end Type 7 trucks with magnetic couplers, and a No. 160 bin (if sold separately). Later editions would have tabbed couplers.

Unlike the earlier issued No. 3451 and No. 3461 this car did not unload all of the logs at one time, but by repeatedly pushing the unload button on the No. UCS or the No. 6019 remote track controller would incrementally raise the center log carrier until the logs were unloaded and the carrier would then return to its normal position.

This car was available in two different boxes. One was labeled No. 3361 and the other No. 3361X. The "X" suffix denotes that this car was included in a set and did not contain the No. 160 Variation E line side bin. This version of the bin was eight inches long, was made out of plastic, and replaced the earlier seven inch bakelite bin in 1955 to accomodate the larger operating cars like the No. 3361.

At least one instruction sheet No. 3361-29 was produced with DARK BLUE ink in WHITE paper and dated 6-58. The FRONT page of this sheet is shown below as is the BACK page.

There are four variations:

Variation A: "LIONEL LINES" in thick 7/32" rubber-stamped serif letters and "336155" on the right side. WHITE plastic is used for the drive gear in the unloading mechanism.

Variation B: Similar to Variation A except the drive gear is BLACK plastic.

Variation C: "336155" is rubber-stamped in a lighter serif letters and on the left side of the "LIONEL LINES" inscription on the side. This variation usually has a MEDIUM ORANGE plastic drive gear that is used in the unloading mechanism and the car. The chassis is molded in a DARKER GRAY color.

Variation D: "LIONEL LINES" in thin 1/8" rubber-stamped sans-serif letters and "336155" on the right side. MEDIUM ORANGE plastic is usually used for the drive gear in the unloading mechanism and the car chassis is molded in a DARKER GRAY color.