On the third and fourth lines you can put the statements to evaluate. You can insert a [[Special:MyLanguage/TrainCarts/Signs/Direction|direction]] followed up by ''':''' and then the statement to set the direction to switch to. For example:
在第三行和第四行，你可以设置要判定的语句。你可以插入方向，后跟 :，然后设置要切换的方向的语句。例如：