LEGO 6991 Space Monorail Transport Base. With 9V Motor and Lights. Retired and rare - r eleased in 1994.The item "Lego Vintage Space 6991 Monorail Transport Base in original box, RARE" is in sale since Monday, January 13, 2020. This item is in the category "Toys & Hobbies\Building Toys\LEGO Building Toys\LEGO Complete Sets & Packs". The seller is "fr0nz65" and is located in Graz. This item can be shipped worldwide.