After many years have got back to detailing some locos ( 2-6-2T 82004 comes to mind as one) and have forgotten what diameter wire is ideal for 00 locos, I see Mainly Trains have 0.45, 0.7 and 0.9mm wire . Also are the handrail knob holes large enough for the 0.9mm? It may come down to personal preference I suppose.
Thanks John Firth