The first group of the Central's K-5b Pacifics, represented here by No. 4907 (originally CCC&StL 6507), came from American Locomotive Company in 1926. They had 79-inch drivers, cylinder dimensions of 25x28 inches, and a boiler pressure of 205 p.s.i. They weighed 297,500 pounds and produced 38,600 pounds of tractive effort, augmented by a booster putting out 9,950 pounds of tractive force. For other dimensions, consult the commentary for No. 4933 following. Other photos of this formerly Big Four group reveal that they did not have the Elesco bundle-type feedwater heater characteristic of most of the K-5s but another type, probably the Coffin.

This image of Pacific No. 4907 was provided from the David Loeffler collection. The engine is apparently being towed backward from the passenger terminal to the roundhouse by Hudson No. 5395 (note the Walschaerts valve gear in reverse position and the flagman on the pilot protecting the rear of the movement). The probable location is Cincinnati, where New York Central (specifically, Big Four) locomotives could end their runs at a major terminal having arrived from two different directions. The date has to be the late 1930s, after No. 4907 assumed that number in 1936 but before the introduction of the Central's Gothic lettering in 1940. The photographer remains anonymous.