The NYC used their new GP-20s in the Manhattan westside yards. I used to bicycle over and watch the engines couple up to the freights that would head upstate.
When Tyco brought out their GP-20, a very accurate model with correct numbers, I went out and bought two. They had a power truck in the cab, a big weight and a dummy second truck. There was no frame. Unfortunately the single power truck they used just didn't work well at low speeds. In addition the traction tires caused all kinds of mayhem at switches.
I have seen many of the GP-20s with new mechanisms - Atlas worked well. The shells were nicely done but you had to fill in the little retangular holes used to mount the Tyco drive.
When Tyco brought out their GP-20, a very accurate model with correct numbers, I went out and bought two. They had a power truck in the cab, a big weight and a dummy second truck. There was no frame. Unfortunately the single power truck they used just didn't work well at low speeds. In addition the traction tires caused all kinds of mayhem at switches.
I have seen many of the GP-20s with new mechanisms - Atlas worked well. The shells were nicely done but you had to fill in the little retangular holes used to mount the Tyco drive.