It is called the High way bus (プラ電動ハイウェイバス). The more correct translation would be the Electric-Plastic Highway Bus. 
This specific model was manufactured between 1966 to 1969. The outer white parts is plastic while the internal part with the printing of the people is made from sheet metal. The internal drive unit is exactly the same as the ones used in the 1960s in Plarail models.
There are other Highway buses in the Plarail/Tomy Motorised range made in the past.
I hope that helps.
-plarnold
This specific model was manufactured between 1966 to 1969. The outer white parts is plastic while the internal part with the printing of the people is made from sheet metal. The internal drive unit is exactly the same as the ones used in the 1960s in Plarail models.
There are other Highway buses in the Plarail/Tomy Motorised range made in the past.
I hope that helps.
-plarnold
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