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Picture of Micro Knex Propulsion System
here is an instructable of a micro knex station for a roller coaster

Step 1: The Back

Picture of The Back
you need to make the backing
 
Tornado964 years ago
One problem! Where's teh station. This is just a chain taking a car over a hill. You need a platform... :-P
storm391 (author)  Tornado964 years ago
darn, forgot.... XP
You gonna edit it? :-P
storm391 (author)  Tornado964 years ago
nah, im movin to colorado and all my knex are allready packed
lol
~KGB~4 years ago
nice