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Mini O27 Track Plans

The limitations of the conventional O27 track geometry become clear, if you compare these layouts with their HO counterparts. O27's 8-segment circle with its 45 degree curves.is easy to use, yet limited in some configurations. A big problem is the switch machine, which requires extending the layout area significantly. Nonetheless, with its very tight curves, O27 can take less space than all but TT and N scale..

4' by 2' 6"
(2) O27 half straight
(10) O27 O-27 curve 45°
(1) O27 O-27 lefthand turnout
(1) O27 O-27 righthand turnout

5' by 4'
(12) O27 O-27 curve 45°
(2) O27 O-27 lefthand turnout
(2) O27 O-27 righthand turnout

4' by 3'
(3) O27 half straight
(10) O27 O-27 curve 45°
(2) O27 O-27 lefthand turnout
(2) O27 single straight
(2) O27 track bumper

5' 4" by 3' 4" Note how switch machines require extension with half sections.
(9) O27 O-27 curve 45°
(1) O27 O-27 lefthand turnout
(7) O27 single straight
(6) O27 half straight
(4) O27 track bumper
(3) O27 O-27 righthand turnout
(1) O27 cross 45°
(1) Unknown track section
(1) O27 cut straight

4' by 3'
(4) O27 half straight
(10) O27 O-27 curve 45°
(1) O27 O-27 lefthand turnout
(3) O27 single straight
(3) O27 track bumper
(1) O27 cross 45°
(1) O27 O-27 half curve 22.5°

4' 6" by 3'
(11) O27 O-27 curve 45°
(1) O27 O-27 righthand turnout
(1) O27 cross 45°
(3) O27 single straight
(1) O27 track bumper
(2) O27 cut straight

4' by 3'
(5) O27 half straight
(9) O27 O-27 curve 45°
(2) O27 O-27 lefthand turnout
(5) O27 single straight
(4) O27 track bumper
(1) O27 cross 45°
(2) O27 O-27 half curve 22.5°

5' by 3'
(10) O27 O-27 curve 45°
(1) O27 O-27 righthand turnout
(1) O27 cross 45° 5
(5) O27 single straight
(2) O27 track bumper
(2) O27 cut straight
(1) O27 O-27 lefthand turnout

4' by 3'
(4) O27 half straight
(9) O27 O-27 curve 45°
(3) O27 O-27 lefthand turnout
(4) O27 single straight
(3) O27 track bumper

5' by 4'
(13) O27 O-27 curve 45°
(1) O27 O-27 righthand turnout
(1) O27 cross 45°
(9) O27 single straight
(2) O27 O-27 lefthand turnout
(3) O27 track bumper
(2) O27 half straight
(2) O27 cut straight
(2) O27 O-27 half curve 22.5°

4' by 3' 6"(6) O27 half straight
(9) O27 O-27 curve 45°
(5) O27 O-27 lefthand turnout
(3) O27 single straight
(5) O27 track bumper
(2) Marx O27 single

6' by 4'
(13) O27 O-27 curve 45°
(3) O27 O-27 righthand turnout
(1) O27 cross 45°
(13) O27 single straight
(3) O27 O-27 lefthand turnout
(6) O27 track bumper
(5) O27 half straight
(2) O27 cut straight
(1) O27 O-27 half curve 22.5°

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