in the most cases you can skip the z-movement and calculate it into the loading time. If you need the z-movement (e.g. in 3D), then you can model it with two transporters, one transporter on the monorail (track) with loadbay type track, an other transporter on this transporter for modeling the z-movement. You can set acceleration in both axis.
For x- positions you can set sensors on the track and stop the transporter there. The same you can do in z-direction.