Here is a great billboard from the Golden Days of toy trains. This one was put out by Marx Trains, #0226. You had two color choices: green or yellow. You could buy lighted or unlighted. There were a variety of different billboard ads used.
This one advertises Colgate toothpaste.
Use with traditional O, O-27 and S gauge--even great with Standard Gauge. These are close to the size of the mosre familiar Lionel ones if not a little bigger.
CONDITION: C-6. Complete. Tested and working. The billboard shows a little bit of age. The frame has some gashes in the plastic some melted tape residue. The box is complete and shows signs of age, but is structurally all here.