When did the diesel and gasoline engines replace the steam engine?

Diesel and gasoline engines began to replace steam engines in the late 19th and early 20th centuries. The widespread adoption of internal combustion engines in automobiles and trucks during the early 1900s, alongside advancements in diesel technology, contributed to the decline of steam power. By the mid-20th century, steam engines had largely been replaced in most applications, particularly in transportation. However, steam engines continued to be used in certain industries, such as power generation, for several decades thereafter.