The theory section is all the theory required to pass your drivers license. Its important to combine theory with practical driving practise.

(A39) Train crossing

The sign indicates a crossing railway or tramway with one or more tracks. The sign is posted immediately prior to a level crossing. It does not have to be posted on a private road with limited traffic where it can be omitted without threatening traffic safety. The sign can also be posted at unlevel railway or tramway crossings.