About 18 years ago I had a 4-wheeled ride-on toy that had handlebars that you moved forward and backwards to create locomotion. Depending on which direction the "cam" was on the rear wheels and whether you pushed or pulled first would decide if you went forward or backwards. Steering was controlled by the feet by simply turning the solid axle.
Anyone know what it's called?
Sounds like a "Green Machine." No wait, that had three wheels and was more like 28 years ago. D'oh.
I believe you're referring to an Irish Mail. It's a handcar and a Google image search with those words will give you more images, but here's one on the bottom right of this image: