The KW transformer has four sets of terminals. one above the other is a set. each is controlled by its one lever.
Check this out with a 24v light bulb.
wiring is to outside rails and middle. The outside rails are common.
if your whisle and bell control does not work as listed reverse the wires.
The engine will run eather way with no problem.
The engine could be touchy or finiky.
Some time when you move back to "0" to reverse. the engine does not. sometimes you have to tap the tender or engin to release the reversing unit.
With the KW you can run four different independent tracks.
When you get experiance you can make different blocks and run different speeds. but you have to be very alert.