I have a question for all of you guys and gals on here. Would it be possible in any way to simulate a hydrostatic drive in lego using pneumatics? I've been trying to figure it out but can't come up with anything.

Sidebar-I just watched a show on Scania trucks and now I see why they're so popular

I would also be interested to see if someone can pull this off. I have tinkered with Pneumatic automatic transmission designs that use a "fluid" coupling rather than a direct mechanical connection. This usually ends up in me building a terrible approximation of a pneumatic engine connected to a pneumatic pump, which is a pretty poor way of transmitting power.

Despite all my failures though, I remain fascinated with the concept.

I was wondering too

pretty interesting i have thought of it before but forgot about it 

I used 4 small cylinders with water for a l gauge "steam" train, 2 pushing the rods and 2 driven by a motor

I hoped it would move realistically but was jittery even after removing all the air I think the problem was the rubber hoses, would like give it another go but I am out of cylinders