Yes I do- I have the space station monorail set although it is far from complete, I got it by saving up all my money from a birthday and buying it,
http://lego.wikia.com/wiki/6991_Monorail_Transport_Base
It still resides in my loft in a battered box, it uses a pp3 9v battery (like a smoke alarm) which is housed in a box in one of the carriages, the centre unit is the motor housing. each end is a carriage with a bogie under it, the centre drive unit acts as a support for each carriage so each carriage has a bogie on the end and connect on a pivot to the drive on the centre, this makes it hard to add any additional carriages as there aren't any couplings at either end, it always ran well enough and had a selector switch where the direction could be changed.
If you want any more specific. Details or photos I can pull the set out of the loft?
