Layouts that nearly or completely fill a room are often oddly-sized. That still doesn't prevent one from adapting ideas to suit a different space—or even a different scale.
Layout Name
Scale
Scheme
Shape
Size (in)
Amtrak
N
loop
custom modular
140 x 222
Big Pass
island
60 x 120
Black River & Western
point-to-point
around the walls
224 x 178
Boston & Maine
switching
J in a corner
96 x 132
California Central
loop with branches
J + island
96 x 96
Cherry Tree Branch
loop with branch
102 x 132
Delaware & Hudson
double-decker
120 x 264
Franklin & Manchester
L in a corner
102 x 120
Green River & Southern
over/under
Leesburg & Kipling Port
54 x 108
Milford Mines
96 x 120
Missouri Pacific Hoxie Sub
loop with cutoff
144 x 156
Ogdensburg Branch
Plummer Junction
loops with wye
Port Reading
Quarryton Branch
HO
Switching
108 x 144
Raritan River Branch
U-shape
120 x 123
SeaTac Industrial
South Richmond Industrial
Sunnyside Yard
passenger yard
peninsula
44 x 174
Swinnerton and Southern
116 x 160
Thomasville Southern
74 x 124
Wrightstown Branch
108 x 120
Virginia Northern
96 x 114