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BrickSet lists 6990 under the Futuron space sub-theme and 6991 in the Unitron space sub-themes. There was also a Monorail sub-theme of City.


I went to Brickcon 2012. I asked Joe Meno about his red Monorail and he was most helpful. He flipped it over to expose the undercarridge and he was able to show me LEGO tires with fifteen hours of running time. The tread does indeed wear off and the tires actualy begin to split. The rubber doesn't cling to the rails themselves, but residue does begin to ...


For the molds: An injection mold is made for a specific injection molding machine. I very much doubt Lego is still using the same machines as they did 20 years ago. So to keep the molds, they would have to keep the old machines, including the service teams and infrastructure. Also, machine parts are rarely made out of stainless steel, some old Lego ones ...


Maybe the plastic is worn off just enough that the switch is not pushing the pins completely anymore. Debug step 1: When the train pins are in the switch zone there shouldn't be a lot of space between the point of the pins and the face of the switch. If it looks too loose that could be the problem. A way to test this would be to put some clear scotch ...


Try to keep the track in mint condition. For example, don't expose it to extreme heat or cold. Keep it away from any pets or children who don't know better. Looking at some pictures, it seems that the vehicle on the monorail runs on a gear. Try interchanging gears every so often so that the gears don't wear and the teeth don't get bent or break.


The track is pretty durable. I have several pieces of old track that the motor runs on well. With the 3D printers now available I am hoping to be able to "print" some of the track with ABS filament. Getting the gear teeth just right will be the tricky part and the end connectors.


First question; yes. as long as they are your CAD models you can do that , for example on Brickshelf Second question: In LDraw , A CAD program for Lego they have monorail parts, here this may also be usefull Monorail Network Planner Tool


Since I'm responsible for both the answer and comment you point to, I don't have much more to say, although there is one capital element I feel I omitted: motors. Track parts being just plastic, they wouldn't actually be that much of an issue to produce again. Maybe LEGO would need to make or even redesign some new molds, but if they felt there was a demand ...

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