I have a BACHMANN SPECTRUM®1:20.3 SCALE 2-8-0 NG OUTSIDE FRAME CONSOLIDATION - DEADWOOD CENTRAL (81295) locomotive, and when I had originally bought this I had purchased track with a curve diameter of 9 feet. I was wondering what the minimum diameter would be for curved track to use with this locomotive, as I need to purchase more track for my backyard layout. Would 8 foot diameter track be suitable? As it is somewhat cheaper than larger diameters. Any help or advice would be greatly appreciated.