The railway embankment has become a bit of a model railway photography cliché but there's no doubt that it does create a fine simple diorama to present rolling stock for display and photographs. Martyn Welch described is embankment in Model Railway Journal No. 124
16in long x 8in high x 6in deep
Park Bank is the name I've given to my effort!
Christ Nevard's Blog post about model railway photography