Abstract: In a locomotive having at least one electrical load connected to at least one power source via a locomotive power carrying bus, a system for ensuring a current connection between the at least one power source and the at least one electrical load is provided. The system includes a first rectification device, wherein the first rectification device is connected between the at least one electrical load and the locomotive power carrying bus to provide a rectified current connection between a first power source and the at least one electrical load.

Abstract: A safety cover, which securably and reliably prevents the readvancement of the tip of a cannula once it has been retracted thereinto, is designed having an elongate body which includes an axial channel having elements which displace and block linear passage of the cannula once it has been retracted. In a first embodiment the displacing elements are inwardly and rearwardly extending bristles which provide for unidirectional motion of the cannula relative to the safety cover, thereby locking the cannula once it has been retracted. In a second embodiment, the displacing element is the axial channel itself which has a curvate bias and distorts into a non-linear path once the cannula is retracted. In a third embodiment, the displacing element is a spring plate which, when compressed permits the cannula to pass through, but once the cannula has been retracted, expands to prevent the tip from being readvanced.

Abstract: A safety cover which securably and reliably locks the tip of a cannula in an interior chamber within the safety cover. The cover comprises an elongate body having the interior chamber and an axial through hole which extends along the entire length of the body, through the interior chamber and through which the cannula is slidably received. Displacing elements are positioned within the interior chamber, each of which includes a hole for receiving said cannula therethrough, and which displaces upon retraction of the tip of said cannula, thereby preventing subsequent advancement of said cannula tip. In a first embodiment the displacing elements are annular rings. In a second embodiment, the elements are rigid balls having through holes. In a third embodiment, the displacing elements are a pair of conical elements, one of which is spring biased, each of which includes an offset hole.