AUTOMATIC OPERATION OF STORAGE SIDINGS
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Our units give automatic operation of storage sidings with any number of sidings.  There is a choice of abrupt stop (using the Dual Timer) or gradual braking and acceleration (using the SA6 or SA6-B).  For both methods an IRDOT-P is required at the end of each siding.
When the front of a train reaches the IRDOT-P it switches the points, isolating the arriving train and powering another train for departure.
A train enters siding 1 and reaches the IRDOT-P which switches the points to siding 2.  A train departs siding 2.
A train arrives at siding 2 and reaches the IRDOT-P setting the points for siding 3.  A train departs from siding 3.
A train arrives at siding 3 and reaches the IRDOT-P setting the points back to siding 1.  A train departs siding 1.
This completes one cycle, which is then repeated.
This arrangement can be extended for any number of sidings.
Self-isolating points are used (PECO points are suitable) so that changing the points isolates the arriving train and powers the departing train.  Note that every point motor coil is only wired to one IRDOT-P so no diode matrix is needed. A connection is made to the "I" terminals of the IRDOT-P to prevent the points operating whilst a train is departing.
For storage sidings with an abrupt stop and start, the dual timer provides the  connection to the "I" terminals. 
When a train arrives and is first detected by the IRDOT-P, the "P" terminal switches for a short time.  This starts the first timer. 
The first timers relay is wired to cut off track power whilst timing.  This provides an adjustable delay between one train arriving and the next departing. 
The first timer is wired to trigger the second timer when it finishes timing.
Track power is now restored and the connection made to terminal "I".  This allows the departing train to cross the IRDOT-P without activating the points.
The timer is adjusted to finish its timing cycle before the next train arrives at the storage sidings.  The dual timer provides both timers and only one board is needed for any number of sidings.
Power supply connections have been omitted for clarity. All "V02 and "0" terminals are connected to negative of the power supply. All "+" terminals are connected to the power supply's positive.
SA6 Controlled Storage Sidings
To operate the storage sidings with gradual acceleration and braking, one IRDOT-1 plus one SA6 or SA6-B are required to operate any number of sidings.  As the train crosses the IRDOT-1 the SA6 starts reducing the trains speed.  As the train reaches the IRDOT-P the points change and the "P" terminal "tells" the SA6 to stop the train and start the adjustable timing interval before the next train departs.  As the next train departs, the SA6 connection to the terminal "I"s of the IRDOT-Ps prevents the IRDOT-Ps operating the points.  This connection is released when the next arriving train crosses the IRDOT-1.
The SA6-B controls the storage sidings in the same way as the SA6.  However it has extra terminals "OI" and "TIS" to allow the storage sidings to form a block section.  Combining the SA6-B with other SA block system units allows a number of trains to move at the same time round an oval with storage sidings.
A further use of the SA6-B would be to wire a switch to the "OI" terminal.   Operating the switch would give control of when trains leave the storage sidings.