Creating ski gondolas/tramway with Duplos I've got a three year old who just came home from a ski vacation where he was enamored with the gondolas (like below).



I want to make one with Duplos for him. I'm most of the way there, but have a few specific issues.  He has a 21 month old brother, so I can't use regular legos (or I think this would be easier).

I have the cab from this set:



I plan to attach it to the bottom of a regular wheel base (like the wheel base from the same set), which creates the gondola - all good so far.  However, I haven't figured out how to recreate the track/wires/etc. without some permanent modifications. 

I have a pretty large supply of Duplos to work with (including the large powered train set), and I live in an area with a large Lego Store and a Legoland, so I probably have access to anything that is produced and sold in the US, and I don't mind buying odd sets - I just haven't found something that seems like it would work.  I have plenty of duplos to build a little mountain with, and the little guy has sufficient imagination that he won't require a specific color scheme or a skier minifig (which I also haven't found).

I have considered using track, but I don't think I quite have the space for that (as it would take up a lot more) - and would rather do something that appears more like string/wires, as he's very aware of how that works and is very bright and detail oriented.

Specifically size-wise, I plan to build a mountain around 10-20 dots square, and about 8-12 bricks high (this depends in part on how many bricks I decide to use, and on how high it needs to be to make the gondolas work).  I would put the gondola 'base' a bit away from the mountain, and the gondola end point near the top of the mountain.  Sort of like how Playmobil did theirs:



except with a nice large Duplo mountain and a less complex base (I probably would just do a 8x4 platform or whatever size was necessary to manage the setup.)

In particular, I'm looking for suggestions for how to manage the hanging aspect.  Since it's on a wheel base, I can put that wheel base on top of strings or wires or something else, but I don't know how to do that within the Duplo setup; I can make large knots or something through small openings in various piece combinations, and use regular string, but I'm not sure I could do that in such a way that the wheels would stay on (These are regular wheel base wheels, so they don't have anything that would help them stay on the wire/string).
What I have done so far: used a ribbon like suggested, but more of a clothes ribbon. It works well - the fabric fits in the spot behind the wheels and friction is usually enough to prevent it falling back. I have yet to add the winch (not sure it will be  long enough but will see when I get it next weekend). I used a simple stack of squares to anchor it - on the bottom needed a bit more support for some reason but nothing fancy. 

(The buildings were child made, by the way :)