 Complete the following phrase:  That explanation is contradicted by Pennsylvania Place Names. Although Altoona, in Blair County, is popularly known as the Mountain City, its name has no direct or indirect etymological relation to the Latin adjective altus, signifying elevated, lofty. Two very different explanations of the origin of the name are current. The one which seems to be the most likely and reasonable runs as follows: The locomotive engineer who ran the first train into Altoona in 1851 was Robert Steele, who died several years ago, aged nearly 90 years. He was then the oldest continuous resident of the city. He was much respected and had long been one of the private pensioners of Andrew Carnegie. Mr. Steele is authority for the statement that Col. Beverly Mayer, of Columbia, Pennsylvania, who, as a civil engineer of what was then the Pennsylvania Central Railway, had laid out the tracks in the yards of the newly projected city, named the place Altoona after the city of Altona in Danish Holstein, which became part of Germany in 