electronic control panels and software; digital signal processors; electrical circuits and software for railroad track controls; railroad track monitors and remote alarms; railway interlocking controllers, switches, lights, circuit boards and software; radios; railroad and locomotive communication electronics and software; battery charger electronics and circuit boards; transfer switches, electronic memory testers, color light simulator electronics, electricity surge arrester electronics, crossing track simulator electronics; communications and telephone handset cradles and cups; telephone handsets and radio microphones.