You can use the electric zipline trolley and controller to teleport the engineer. Here's how you do it. Have a zipline trolley with zipline controller as your selected weapon. Be on foot, not hanging from a zipline. Go into map view. Scroll map view so that a power pole far from you is close to the center of the screen. Hover the mouse on that power pole then press the Use zipline shortcut. The engineer is now hanging on that power pole with their zipline trolley. Press the use zipline shortcut again to dismount.

I think this is unintended behavior, the Use zipline shortcut should allow mounting onto a pole if it's close to the player, not if it's close to the center of the screen.