All rails with a speed of zero will temporarily forget that they are set to zero after sector loading is complete. As a result, docked entities may move onto rails that are not speed controlled.
This makes carrier launch systems using the new pickup and launcher rails useless, as every time a sector is loaded docked ships will launch automatically if the "resting" rail (speed set to zero) is positioned in sequence with a normal rail or pickup rail.
This was tested by me on a very populated multiplayer server using a complex ship, and in singleplayer in a new world using only a rudimentary test ship and basic drone.
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-Rejected-
This is a duplicate of T19, merging this one.
However, I want to point out that there are different ways to make sure an entity doesn't move, and that is by setting a different rail direction that leads to nowhere, it will cause them to halt at that spot till you set the correct orientation again.
To launch/stop you would just need to hook up an activation module to the correct pick up rail orientation and set it to that last block before the shoot out rail.
I can make you a small blueprint example if needed (please contact me on SMD about that, same username).
Alright, glad to see somebody else found this, but the way I tried to search for it didn't reveal T19. I know this can be avoided using orientation, but I still felt like I should have reported it.