Components of a track lighting system comprising: a track comprising a track housing having: a slot housing (1302, 1322) sized for receiving a fixture mounting adaptor within a slot volume located between two outer side-walls extending dorsally alongside each other from a slotted face-wall and on either side of an aperture to the slot volume in the slotted face-wall, power contact assemblies comprising electrical power rails extending longitudinally along the track and within the slot, magnetically attracted material attached to the track housing, and two mounting wings, each mounting wing comprising a wall extending laterally from a base region integrally attached to a respective one of the side-walls where the side-wall meets the slotted face-wall; and a mounting adaptor sized to fit within the slot and make electrical contacts with the electrical power rails; wherein: the mounting adaptor is attached in a mounting assembly with a mounting module including magnetically attracted material, material, wherein at least one of the magnetically attracted material of the mounting module and the magnetically attracted material attached to the track housing is magnetic, and the mounting assembly is sized and shaped so that the mounting assembly is magnetically held to the magnetically attracted material attached to the track housing when the mounting adaptor is inserted to the slot to make electrical contacts with the power contact assemblies; and wherein each mounting wing laterally terminates in a region dorsally offset from the base region. a track comprising a track housing having: a slot housing (1302, 1322) sized for receiving a fixture mounting adaptor within a slot volume located between two outer side-walls extending dorsally alongside each other from a slotted face-wall and on either side of an aperture to the slot volume in the slotted face-wall, power contact assemblies comprising electrical power rails extending longitudinally along the track and within the slot, magnetically attracted material attached to the track housing, and two mounting wings, each mounting wing comprising a wall extending laterally from a base region integrally attached to a respective one of the side-walls where the side-wall meets the slotted face-wall; and a mounting adaptor sized to fit within the slot and make electrical contacts with the electrical power rails; a slot housing (1302, 1322) sized for receiving a fixture mounting adaptor within a slot volume located between two outer side-walls extending dorsally alongside each other from a slotted face-wall and on either side of an aperture to the slot volume in the slotted face-wall, power contact assemblies comprising electrical power rails extending longitudinally along the track and within the slot, magnetically attracted material attached to the track housing, and two mounting wings, each mounting wing comprising a wall extending laterally from a base region integrally attached to a respective one of the side-walls where the side-wall meets the slotted face-wall; and a mounting adaptor sized to fit within the slot and make electrical contacts with the electrical power rails; wherein: the mounting adaptor is attached in a mounting assembly with a mounting module including magnetically attracted material, material, wherein at least one of the magnetically attracted material of the mounting module and the magnetically attracted material attached to the track housing is magnetic, and the mounting assembly is sized and shaped so that the mounting assembly is magnetically held to the magnetically attracted material attached to the track housing when the mounting adaptor is inserted to the slot to make electrical contacts with the power contact assemblies; and wherein each mounting wing laterally terminates in a region dorsally offset from the base region. the mounting adaptor is attached in a mounting assembly with a mounting module including magnetically attracted material, material, wherein at least one of the magnetically attracted material of the mounting module and the magnetically attracted material attached to the track housing is magnetic, and the mounting assembly is sized and shaped so that the mounting assembly is magnetically held to the magnetically attracted material attached to the track housing when the mounting adaptor is inserted to the slot to make electrical contacts with the power contact assemblies; and wherein each mounting wing laterally terminates in a region dorsally offset from the base region.