A hand brake having mechanism for retaining the hand brake in a substantially released and hold position to prevent unwanted application of the railway car brakes due to vibration or other energy sources during railway car motion. A length L in \u03bcm between a first point of intersection P between the track width controlling groove formed in one of the magnetic core halves and one lateral edge of the groove and a second point of intersection Q between the magnetic gap g and the other lateral edge of the groove is related with an intensity of the recording current I mA by L\u226711. The floating flywheel assembly rotors move inside generator stators to generate electric power. The oligomers of the invention can be incorporated into pharmaceutically acceptable carriers and can be constructed to have any desired sequence, provided the sequence normally includes one or more bases that is replaced with the analogs of the invention. The network device further includes a routing engine to asynchronously collect the requests and create a multicast usage report. Subscriber telephone numbers can be aggregated and accessed through a single contact point.