LEGO on Twitter: "Let's take a trip back in time. ✌️ In the 80's and 90's, we released several Light & Sound System sets like this one from the Space theme (6990).
6990-1 Monorail Transport System in Microscale | My submissi… | Flickr
LEGO 6990 Futuron Monorail 03 | Dan Rubin | Flickr
LEGO 6990 Monorail Transport System Set Parts Inventory and Instructions - LEGO Reference Guide
BrickLink - Original Box 6990-1 : LEGO Futuron Monorail Transport System [Space:Futuron] - BrickLink Reference Catalog
REVIEW: 6990 Monorail Transport System - LEGO Sci-Fi - Eurobricks Forums
LEGO 6990 FUTURON Space Monorail Set 100% Complete w Instructions, no box, 1987 £456.07 - PicClick UK
LEGO 6990 MONOROTAIA con Stazione / Futuron Monorail Transport System 9V (1987) EUR 349,99 - PicClick FR
LEGO Space: Monorail (6990) for sale online | eBay
LEGO 6990 Futuron - Monorail Transport System, REVIEW - YouTube
REVIEW: 6990 Monorail Transport System - LEGO Sci-Fi - Eurobricks Forums
Vault 1541: [YouTube] LEGO Futuron Monorail Transport System
LEGO Space: Monorail (6990) for sale online | eBay