Hi all, I am returning to the model railroading hobby after a long break, and would like to give z scale a try. Space is at a premium, and I'm looking at using some flex track to test minimum radii before locking anything down. I plan to eventually run three steam locomotives - 0-6-0 or 0-4-0 if I can find one, a mid size such as a 4-6-2 and a larger locomotive which will likely have 8 main wheels (Mikado or similar). Is there any relatively inexpensive piece of rolling stock I can buy purely to test corner radius, before committing to the cost of a large locomotive? And/or will my 8 main wheel locomotive likely be the limiting factor when it comes to corners? I haven't found much in the way of dummy locos in this style. Thank you very much in advance for any advice here.