A vehicular apparatus (VA; VA') for producing compressed air comprising: - an internal combustion engine (ICE; ICE'); - a pneumatic supply circuit configured to supply a braking device operable by pneumatic supply; - first compression means (TC, CY, CY') for compressing air; - second compression means (C, CY, CY') for compressing air compressed by said first compression means (TC, CY, CY'); - first supply means (L, L2, IM, LU) configured to draw compressed air downstream of said first compression means (TC, CY, CY') and supply the drawn compressed air to said second compression means (C, CY, CY'); - second supply means (L1, LU) configured to draw compressed air downstream of said second compression means (C, CY, CY') and supply the drawn compressed air to the pneumatic supply circuit; wherein said second compression means (C, CY, CY') comprise a volumetric compressor to directly supply the pneumatic supply circuit; said second supply means (L1, LU) comprising a first supply line that pneumatically connects an outlet of the compressor to the pneumatic supply circuit; characterized by further comprising: - a gas receiver device (T, IM, GL) different from the pneumatic supply circuit and adapted to receive a compressed gas for the use or storage thereof; - third supply means configured to draw compressed air downstream of said second compression means (C, CY, CY') and supply the drawn compressed air to the gas receiver device (T, IM, GL), wherein said third supply means comprising a third supply line that pneumatically connects the outlet of the compressor to the gas receiver device (T, IM, GL), so that the gas receiver device (T, IM, GL) can receive air in output from the compressor,wherein the first supply line comprises a pressure regulator for reducing a first pressure of the air in output from the compressor to a second pressure lower than the first pressure and suitable for the operation of the pneumatic supply circuit. - an internal combustion engine (ICE; ICE'); - a pneumatic supply circuit configured to supply a braking device operable by pneumatic supply; - first compression means (TC, CY, CY') for compressing air; - second compression means (C, CY, CY') for compressing air compressed by said first compression means (TC, CY, CY'); - first supply means (L, L2, IM, LU) configured to draw compressed air downstream of said first compression means (TC, CY, CY') and supply the drawn compressed air to said second compression means (C, CY, CY'); - second supply means (L1, LU) configured to draw compressed air downstream of said second compression means (C, CY, CY') and supply the drawn compressed air to the pneumatic supply circuit; wherein said second compression means (C, CY, CY') comprise a volumetric compressor to directly supply the pneumatic supply circuit; said second supply means (L1, LU) comprising a first supply line that pneumatically connects an outlet of the compressor to the pneumatic supply circuit; characterized by further comprising: - a gas receiver device (T, IM, GL) different from the pneumatic supply circuit and adapted to receive a compressed gas for the use or storage thereof; - third supply means configured to draw compressed air downstream of said second compression means (C, CY, CY') and supply the drawn compressed air to the gas receiver device (T, IM, GL), - a gas receiver device (T, IM, GL) different from the pneumatic supply circuit and adapted to receive a compressed gas for the use or storage thereof; - third supply means configured to draw compressed air downstream of said second compression means (C, CY, CY') and supply the drawn compressed air to the gas receiver device (T, IM, GL), wherein said third supply means comprising a third supply line that pneumatically connects the outlet of the compressor to the gas receiver device (T, IM, GL), so that the gas receiver device (T, IM, GL) can receive air in output from the compressor,wherein the first supply line comprises a pressure regulator for reducing a first pressure of the air in output from the compressor to a second pressure lower than the first pressure and suitable for the operation of the pneumatic supply circuit.