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- 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
