An embodiment of the invention for conducting a distributed power train operation, comprises a controller at the remote unit for issuing commands to control the operation of the remote unit on a track, and responsive to a communication loss between the lead unit and the remote unit. The caulking tube replacement tip includes a flange at its base with an adhesive material attached to the bottom of the flange. The invention further includes a method of converting a conventional motherboard and memory socket assembly for such testing. A method of controlling a memory system comprises determining charge level decay of charge storage cells having charge level decay characteristics that are based on lifetime erase operations performed on the charge storage cells; and increasing charge levels of the charge storage cells to offset the charge level decay without first erasing the charge storage cells.