"Old Betsy" was the nickname given to the hand-built prototype of Caterpillar's first diesel engine model, the D9900. Assembled on June 28, 1930, in San Leandro, Calif., she was given the serial ...

In 1931 we introduced the first diesel engine to power our line of earthmoving products. These engines were almost immediately pressed into service by over 20 different manufacturers (other than ...