Hello all,   I'm looking at building a layout and it is hoped to include a gradient. My question is: How steep can a gradient be in 00 gauge. I am looking to include regular steam use on load 5. While I know that the steepest main gradient on the main railway network is 1:49 at Grosmont to Goathland and that the line at Foxfield is steeper. What is the gradients others have been able to use on a layout and how reliable has varied stock been on managing the ascent?   Than