The Mack E-Series (not to be confused with Ford's later "E-Series" of vans) was a chassis produced by Mack Trucks Inc from 1938 to 1951. There were 13 different sub-models of the E-Series, ranging from EB to ETX (with the most popular variants being the EF, EH, & EQ), although the majority of E-Series fire trucks were sold as the Type 45 or Type 505.