The 0126 Uncoupler included a push button for operation and a plastic replica of a German yard signal.
The 0172 15° crossing was later enhanced, making it into the 0173, 0174, 0175 and 0176 double slip switches, which could either be a crossing or a track switch, depending upon the position of the track points. These double slips were available in either “Left Hand” or “Right Hand” versions. The 0173 and 0174 manual double slips were later discontinued and could have been made into remotely operated double slips with the addition of the 0179 switch machine.
In the mid-1970’s, Arnold changed their model number protocols. Track items that had been “0***” were moved into the “1***” series. For example, the Radius 1 90° curved segment that had been “0131” was now numbered “1310”. In general the track pieces remained the same as they had been previously.
Electrical items generally moved into the “7***” series, structures, bridges and vehicles moved into the “6***” series.