In addition to the large control center, the smaller SC 4 DCC control center/booster with 4 amp output at 20 V is available for smaller large-gauge systems. Like its big sister, it also masters DCC with RailCom. The control center comes with a track and programming track connection. It is also interesting to use it as a 4 amp booster. The hand controller 'System Radio' included in the set is also already equipped with a radio module and is therefore prepared for operation as a radio controller. The scope of delivery also includes the switching power supply with 90 watts of power and therefore enough reserve for the first Spur 1 models. The SC 4 can control up to 20 locomotives at the same time, up to 24 locomotive functions can be switched per address, as well as 16 routes and over 2,000 m.