Several accessories were produced with of course the reversing/stop track side switch as the first and maybe most important. These switches were crucial for the unique selling point as mentioned on these original labels:
The function of this reversing/stop track side switch is explained in the next picture:
Other accessories were sold such as a station, a level crossing, a barrel loader etc. All of these accessories added more possibilities and extended the play especially when playing together. Detailed description of several accessories are in the manuals and leaflets in the document section.
The picture below links to the accessories photo gallery showing items from my collection.