1
I made a hydraulic launched kiddie coaster
(i.imgur.com)
This is, obviously, ridiculous, but it was built mostly to check that the shortest possible hydraulic launch would still work. I changed the minimum length from 3 to 2 tiles to simplify the implementation.
There is actually a problem though if you use longer trains than this, if the train hasn't left the station when the catch car disconnects, it thinks it's arriving back in the station and will proceed round the layout at slow speed.
