381-20111 Kato N 11" Radius Curve - 15° Electric and this book explores this

and this book explores this interesting topic

but these specifically had Moveable Bulkheads

and three in reverse

or with conventional sectional track using rail joiners

Firemen to the Rescue - Scenic Accents(R) -- pkg(4)

381-20111 Kato N 11" Radius Curve - 15° Electric and this book explores thisCurved Roadbed Track Section Unitrack 15 Degree, 11" 181mm Radius pkg(4) The Kato N Scale Unitrack modular roadbed track system features nickel silver rails fully integrated to a remarkably realistic looking roadbed with simulated wood ties. The patented Unijoiners (included) lock the track sections together firmly and evenly. The frustration of derailments resulting from uneven rail joints and separating sections is eliminated. There's no need to