Novamodel's paper modeling magazine, number 28, presents the patterns of the passenger road train APPA-4.APPA-4 - Passenger apron airport road train. Developed at the Riga Civil Aviation Plant No. 85 in the early 1970s. It is a passenger semi-trailer with a ZIL-130V1 truck tractor (later ZIL-441410). Serial production was organized in 1973. APPA-4 is designed to transport passengers from the terminal to the ramp and back. APPA-4 production continued until 1999, when it was replaced by a more modern TSA road train.