An example rail kit includes a bracket assembly that is attachable to opposing columns of a device rack, a middle rail that is slidably engaged by the bracket assembly, and an inner rail that is connectable to an electronic device and slidably engaged by the middle rail. The rail kit may include a rail lock that is attached to the bracket assembly and that is to, when the inner rail is not engaged by the middle rail and the middle rail is located at a first position that is forward of a fully retracted position, lock the middle rail by engaging a depression in the middle rail such that the middle rail is prevented from sliding rearward. The rail lock may be released as a result of the inner rail being slid toward a retracted position while engaged by the middle rail.