Andy, Bill Conner of Shelbyville, TN makes articulated riding trolleys that have no springs at all. The entire set of several cars is equalized by a system of rods and levers and it works very well. The lack of springs causes the cars to be very firm with no side to side rocking as can occur when springs are present. Bill also makes those little vertical boiler beam locomotives that can be seen all over the USA these days. Hi Jesse The springing is done by rubber "bushes". These are held in tapered cones and have a "washer" with a curved nose that squeezes it as weight is applied. It actually works very well and gives a surprisingly compliant ride. I will put a sketch up of the arrangement so you can see how it works. As a result the whole wheel set is free to float and thus aligns itself axial to the track on curves hence the reason it is referred to as being 'self steering' Andy MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.