There are several accessories that complement the track. Märklin offers both a turntable and a transfer table.  The turntable is the classic track on a bridge that rotates in a pit.  The locomotive runs onto the turntable and is rotated, either to be run into a stall in a roundhouse or to go back onto the railroad in the opposite direction.  

Courtesy Märklin

In earlier days, the turntable was offered as No. 8998. It has been revised a bit with a new model number, No. 89980, with an improved controller and a transformer for roundhouse operation.  The turntable motor has been improved over the earlier model.  Additional tracks can be added to the table with item No 8997 (a package of eight).

Installation of the turntable requires that you cut a hole in your layout table.  Because the turntable apron covers the cut edge, your saw work does not have to be absolutely perfect.

The turntable is more appropriate for steam locomotives, but diesels and sometimes electric locomotives were serviced in roundhouses. Likewise, the transfer table is more appropriate for electrics and diesels, but there were interesting exceptions to this rule also.

Courtesy Märklin

   As with the turntable, the transfer table was originally marketed under another number, No. 8994.  The transfer table is now No. 89941, with the same motor and control improvements as with the turntable.  An add-on kit, 8995, is available for catenary operation of electric locomotives on the transfer table:

   Märklin and Brawa both make a series of street lights and railroad yard lights that also improve the model railroad scene.