The ejector sign can eject (let exit) passengers of minecarts. You can place it at a station to eject the entire train in one go, or do it for carts individually.
The sign requires power to work.
First line: [train] to eject all minecarts in the train, [cart] to eject minecarts individually
Second line: eject (eject at for ejecting at cords, third line: x/y/z)
Optional offset to eject players, relative to the minecarts. Offset 'axis' are delimited by '/'-signs. The first value sets the forward/backward offset, the second up/down and the third left/right.
Optional angle players look to after being ejected. The first value sets the 'yaw', the angle to look left and right (90 is straight ahead, 180 is to the right, 0 to the left and 270 is facing backwards). The second sets the 'pitch', the angle to look up (negative) and down (positive).
You can remotely eject trains too. Say your train is called train01, then you use the following on the sign: