How could I provide power and/or data coupling between train cars?

Hello all, I'm trying to find a way to create a power/data coupling between train cars that can be connected/disconnected like the car coupling magnets. Has anyone done anything like this? Background: This is so that I can supply power and control to LED lights (and maybe other devices) in the cars being pulled behind the engine, which will provide the power and control unit (Arduino based MCU) I've tried using a micro USB magnetic connector, but they are too bulky and don't flex easily enough for this. I'd love to find out if anyone has engineered anything similar. Thanks in advance!
Arlo

That is correct. Some modelers either use magnets (permanent or electro) mounted strategically under the track to actuate the magnetic trip pin in the couplers to uncouple cars. However, most modelers just use a wooden skewer or pencil to manually open the coupler knuckle to decouple cars. This is acceptable because in the real world train cars are manually decoupled. sal WFB, WI