The engine was made between 1972 to 1974.The part on thr top is called a radio wheel by Lionel.It is a radio antenna and looks like a large brake wheel app. 1 inch across.
That is the 8010-30 “Radio Wheel”. It’s a VHF radio antenna, chrome plated plastic. For a black plastic part, use 622-10.
The marker lights were issued in clear(8111-30) red(8111-31) and green(8111-26) over the production of the 8111(postwar switchers used clear 622-13 / 622-14 LH / RH). The 8111 was cataloged from 1971 to 1974 in sets and for seperate sale.