A spacious, environmentally friendly, energy efficient, socially focused urban transport that is capable of both urban and interurban transportation   The unique mobile accummulator system (MAS) is used in the Pioneer electrobus for the first time in Russia, enabling to increase the distance of the vehicle travelling while retaining the maximum passenger capacity.  The trailer is fitted up with NMC batteries with 150 kWh total capacity, and one 50 kWh battery is placed on the electrobus roof.  Placement of batteries in the trailer enables to operate the electrobus without downtime, because a discharged energy trailer can be quickly substituted with a 100% charged one. The Pioneer's overall motion reserve in fully charged batteries is approx. 200 km. Additional MAS advantages are: no need for upgrading the existing power system; no need for construction of charging stations; the possibility of subsequent upgrading and arranging for interurban communications. The Pioneer is adapted for use in the temperature range from - 40°С tо +40°С. The electric bus uses the climatic system with the "heat pump" and additional electric heater. Several cabin versions are envisaged, with many versions of visual solutions.