Take the A62 motorway to the Konken / Kusel exit, then further in the direction of Kusel and take the B 420 to Kusel / Diedelkopf; here turn left onto the L 176 via Ruthweiler to Thallichtenberg.
In Thallichtenberg follow the signs to Lichtenberg Castle (via the Burgstrasse)
This tour is easily reached by train and bus.
By train, every hour from Kaiserslautern to Kusel. Here you have the possibility to walk along the Fritz-Wunderlich-Weg (signposting from the train station) and enter Diedelkopf to start the Preußensteig trail. Alternatively, the "Burgenbus" bus (bus 297) runs between Kusel and Lichtenberg Castle, which is also well-suited to return to the railway station after finishing the walk at Lichtenberg Castle.