We often hear about colour light signals having two, three or four aspects in their description, but what does this...
Yes, you can use HO figures on your OO scale layout, there is a slight difference in size, but this is negligible in the grand scheme of things. HO gauge is 1/87th that is 3.5mm to the foot, where as OO scale is 1/76th, that is 4mm to the foot....