The Iowa Scaled Engineering CKT-TIMELOCK provides an easy way to add prototypical time-locked switches or dual-control power switches to your model railroad.
Prototype railroads use time locks on uncontrolled switches in signaled territory – often into industrial sidings - to prevent a crew from opening a switch in front of an oncoming train that is expecting clear track based on the last signal they saw. The time delay between a crew requesting to operate the switch and actually being able to move the points is enough that any train already past the nearest block signals would have also passed the switch.
Even the best of machinery fails, and when that machinery is a switch at a busy control point, there is not always time to wait for the maintainer to get there. That's why most prototype power switch machines on North American railways are “dual-control,” meaning they can be operated remotely under power or operated locally with a hand-throw lever.
While common on the prototype, these unique elements of switching industries are seldom modeled. Now, with the CKT-TIMELOCK, it is easy to add additional realism for your switch crews on your layout.
The latest CKT-TIMELOCK hardware design files and source code are now available at GitHub!
CKT-TIMELOCK is made available under license from Nathan Holmes and Michael Petersen. The design is released under the Creative Commons BY-SA license, and the source code is released under the GPL v3.