In the 1950s, Horseshoe Curve looked very different than it does today. It sported only rudimentary facilities and a a small park next to the tracks. One feature of the park was a flagpole. This was dead-easy to model. All I did was print out a a flag, cut it out with an exacto knife and taped it to a piece of styrene.
I also yanked out the tree I planted to cover one of the holes I drilled yesterday. Woodland scenic course turf is just as effective at covering the hole without blocking the view.