The GWR branchline terminus, complete with station, small shed and goods shed/coal yard
The "depot" scene with overly-branded industrial buildings "EWS, DRS ect", in an unrealistic small space
The modern station terminus, complete with half the layout as a MPD servicing only freight locomotives
A large collection of rare locomotives and one-off spceials, all appearing togeather
In general - too much stock and locomotives on the layout at one time
perhaps also, a layout where something is always moving?