These modules were created to accommodate the new Kato large radius super elevated double track. The 90° modules can be used for inside or outside position in a layout. Two modules can be used to make an end cap as shown below.
Corner Modules do not have mounting holes for electrical connector or sky boards.
T-trak modules are designed to use KATO sectional track.
The KATO Unijoiner track connectors are used to align and attach adjacent modules to each other.