Talk:PRR K4s/to do


 * Add references!!!
 * Describe valve gear experiments, results on future motive power policy
 * Describe K4sa project, units converted, benefits, why not generally adopted
 * Discuss iconic nature of K4s, how it became PRR "trademark", appearance in PRR calendar art etc. Grif Teller.
 * Discuss locomotives inspired by K4s, particularly Gresley's pacifics in UK
 * Detailed treatment of survivors, including Offical State Locomotive of PA status of one, restoration attempts, current status.
 * Last years of service, last trains hauled, final in service locomotives, etc.
 * Specifications table