The LNUR Railway Display Tier standards define advisory guidelines on how to create consistent LEGO railway displays with multiple builders.
These guidelines came about to try and provide guidance on what is needed to create a LEGO display with a consistent look and feel. The idea is that if your display falls within a specific tier, it should be roughly compatible in style (if not track geometry!) with other LEGO displays that fall in to that tier.
|Locos & rolling stock||Landscape||Running||Period accuracy|
|Tier 0||Largely LEGO sets; may be some custom models||Partial or incomplete landscapes (e.g., tablecloths in place of landscape). No scenic backdrops or scenic breaks. Little or no ballasting.||None, or very little, realistic running in relation to scale speed, correct consists of rolling stocks. Little or no signalling.||Mix of time periods for rolling stock and landscape.|
|Tier 1||Locomotives and rolling stock are largely custom-built, but with little or no consistent scaling between consists.||Majority of the display is landscaped to a basic degree in LEGO elements. No scenic backdrops or scenic breaks. Some ballasting.||Some realistic running in relation to scale speed, correct consists of rolling stocks. Some signalling.||Locomotives and rolling stock run in reasonably correct, or believable, consists.|
|Tier 2||Locomotives and rolling stock are fully custom-built, with consistent scaling between consists.||Fully landscaped to an advanced degree in LEGO elements. Scenic backdrops present for all or majority of the layout’s length. Public areas are fully ballasted to a consistent standard.||Largely realistic running in relation to scale speed, correct consists of rolling stocks. Some signalling.||Locomotives and rolling stock run in largely correct, or believable, consists, and all consists running on the display at the same time fit a specific period of time.|