The 2nd Engine 51 is a 1000gpm triple combination P-80 Ambassador model powered by a Cummins NH855 250hp naturally aspirated diesel engine driving through an Allison HT-70 power shift transmission. The LACoFD rigs were 1250 gpm triples powered by Cummins NHCT295 turbocharged Diesels driving through Allison HT-70 5 speed manual transmissions. They had 500-gallon booster tanks, as did Engine 51. In their outward appearance both E-51 and the LACoFD rigs were identical. All the County Ward rigs plus E-51 had Federal Q2B sirens and Grover Stutter-tone air horns.