Abstract: An improved mechanical-electrical connector apparatus (3) is disclosed which is particularly suited for joining electrical current carrying rail segments (1, 2) having an axially slotted (5, 6) tube configuration within which a sliding contact can ride. Each end of each rail segment is provided with a circumferentially extending notch (4, 6) opening into the slot (5, 6) on opposite sides. A short connector section of slotted tube (3) is provided with a resilient tongue (7, 8) extending radially within the tube section (3) at each end so that the tongues (7, 8) fit into the notches (4, 6) when the rail segments (1, 2) are inserted into the connector section (3). The rails may be used for guiding and supplying current to a trolley or the like.