In 1947 Lionel introduced its die-cast-bodied Pennsylvania GG1 locomotive. It was a stunning model, even though it was shortened about 30% from scale

The design of the real GG1 turned into an immediate success, able to produce a continuous 4,620 horsepower and a peak horsepower rating of 8,500. The 139 GG1's built were so successful they w ere used up until 1980.