The information on  the following pages provides telegraph calls during different eras along the Lehigh Valley Railroad.

• 1858 – from Robert Sayre’s diary

• 1905 – from a Lehigh Valley Railroad document

• 1930-40 – east to west listing of interlocking towers with details and                             call letters for each

• Packerton and East – from 1963 dispatcher’s sheet

• Coxton and West – from dispatcher’s sheet