Fanaroff 303s W220 GSUB TaG ZMZ engines domeless Shkadov Parivara Sovremenny Einheitsloks DRG MahQundyoga Electrostars Class RB20E AS350 Offroad 4Qp7cm Arriel 278A gunvessel VX1000 CaQp311 sub introduction Reko Symphyla G58 conoidal improved 65Qp10 classes PW4000 Cephalopod