At an antique truck show held recently in Mack's hometown of Macungie, PA, a pack of classic Bulldogs were on display. Pictured is a B61 model, one of the most recognized and famous antique Mack trucks. Rolled out in the 1950s, the B61 with its fresh styling, comfortable cab, and the then-new Mack Thermodyne diesel engine became one of the most popular conventional trucks right into the '60s. They were largely preferred for bulk transport, freight, and construction applications. Some 47,459 B61 models were built between 1953 and 1966 and it remains the most popular Bulldog with Mack enthusiasts and restorers.