Some William's locomotives did not have a reverse board. The simplest way to check this is to pull the shell. If you do not see any electronics it only moves in one direction. If it does have a reverse board see if it has a switch either under the frame or tucked inside. William's is also known to have produced engines that do not have the lock out feature. Depends on the year this was made. I had a F3 that was bare bones, only ran forward.