At 0:09 seconds the locomotive is above Bakers Run at milepost 241.7. This is a 9.0 degree curve with a 4 inch right rail elevation. The speed limit has changed from 35 mph to 30 mph for freight and 44 mph for passenger trains on the Horseshoe Curve. The degree of climb is 1.34.
At 0:33 seconds the curvature stiffens to 9.4 degrees at milepost 241.8. The degree of climb remains 1.34.
At 0:44 seconds the public observation area with many onlookers is seen. A PRR GP9 locomotive is on display representing the first fleet of diesel locomotives that replaced steam locomotives in the early 1950's.
At 1:47 the steam locomotive ahead is nearly at the end of the 9.4 degree curve. The degree of climb increases to 1.76.
The steam locomotive used by the Norfolk Southern Railroad to acknowledge its thirty year corporate existence is Number 765. It was built after WWII for the Nickle Plate Railroad, a predecessor component of today's Norfolk Southern Railroad. Number 765 was built by the Lima Company. Today it is preserved and operated by the Fort Wayne Historical Society. In addition, the steam locomotive was assisted by a new diesel locomotive painted in the colors used by the Nickle Plate Railroad when it dieselized in the mid 1950's. Assisted might be the wrong word as the diesel locomotive is an ES44AC model built by GE at Erie, PA. It has 4400 horsepower. In reality is it the steam locomotive that assists the diesel locomotive?
Then there was the sound. The locomotive had both its nickle plate whistle and a PRR whistle. The second sounding of the whistle as the train passed the observation area was the higher pitched scream of the PRR whistle. Add to the sound its amplification off the rock face to the right and the giant amphiteater that is the Horseshoe Curve was demonstrated.
What the sound of a steam locomotive working against a steep grade and severe curvature demonstrates is how the 1850's civil engineering of the Horseshoe curve is a kink in the Pittsburgh to Harrisburg line.
Compare photographs of a steam powered passenger train operated by Conrail in October of 1976 over the Horseshoe Curve. Conrail had been formed from bankrupt railroad companies in April of 1976. Its principle component was the Penn Central Railroad Company which had earlier been the product of a merger between the Pennsylvania Railroad and the New York Central Railroad.
The steam locomotive was a Reading Railroad T1 steam locomotive built after WWII assisted by a GP30 locomotive with 2250 horsepower. The T1 steam locomotive was owned by a group of persons at Akron, Ohio wanting to operate and maintain a steam locomotive.
Seen below and expressed by the large cloud of white steam is the point where the steam locomotive lost traction and wheels spun wildly as the engineer cut the throttle in order to regain traction. This is at about 0:25 on the video.