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     Adam photo
     AK Renovo photo
     Albion photo
     Alford photo photo photo photo photo photo
     Alto photo photo 
     Altoona PA  photo
     Antis Altoona photo photo 
     AP Apollo photo photo
     AR Gallitzen photo photo photo
     Arsenal Philadelphia photo photo photo photo
     Ashmore photo
     Banks photo photo photo photo
     BD McBride photo
     BE (Brooke) Birdsboro photo photo photo photo photo
     Beck Pittsburgh photo
     BF Broadford photo
     BG Etna photo photo photo photo
     BJ(Belt Jct.) Reading photo
     BK(Buchannon Jct)Meadville photo photo photo photo
     BK(RDG) Pottstown photo
     BO Birdsboro photo
     Bridge 60 Scranton photo photo  
     Brill Philadelphia photo photo
     Bruin Shenango photo
     Bryn Mawr photo photo 
     BS Uniondale photo
     C East Conemaugh photo photo photo 
     CA Mill Creek Jct. photo
     Castasaqua photo
     Castle New Castle photo
     Cayuga photo
     CF Chadd's Ford Jct. photo
     CF Confluence photo photo photo
     CG Lancaster photo 
     Chestnut Hill photo photo 
     City photo
     CJ Scranton photo
     Cly photo photo photo photo photo photo photo
                    photo
     CM photo photo 
     CO College photo
     CO Cornwells Heights photo
     Cola Columbia photo
     Cork Lancaster photo photo photo photo photo photo
     CP 3 McKees Rocks photo
     CP 3Y Pittsburgh photo 
     CQ photo
     CR Cheat River photo
     CZ Nadine photo photo
     D3 (Delaware Extension Jct.) Philadelphia photo
     D4 University Ave. Philadelphia photo 
     Dexter Hill Nazareth photo
     DG Douglassville photo
     DJ Erie photo
     DN Downingtown photo
     DR(Derry) photo
     Drocton photo
     DV Dillerville photo
     DV Shadyside  photo photo diagram
     DY Yardley photo 
     East Conway photo photo
     Easton photo photo
     EK Eckley Junction photo
     Elkton photo
     Elwyn photo
     Esplen photo
     Eye Corry photo
     Factoryville photo
     Falls Creek photo photo
     Federal St. Pittsburgh photo 
     FM Neville Island photo  
     FO Foley photo
     Forest City photo
     Forge photo photo
     Frazer photo
     FY photo photo
     G Plains Jct. photo
     Garrett photo
     GH(Lane) Wilmington photo
     GI Rock Jct. photo
     Glenwood Jct(WJ)Pittsburgh photo photo photo photo
                                             photo
     GN Laughlin Jct. Pittsburgh photo 
     Gray Tyrone photo photo
     Grundy photo
     GS(Low Grade Jct.) Enola photo 
     Harris photo photo photo photo photo
     HB PH&P Jct. Harrisburg photo
     HK Haucks photo
     Holmes Holmesburg photo photo
     HU photo
     Hunt Huntingdon photo photo photo
     J Allentown photo photo
     J (Lemo) Lemoyne photo photo photo photo photo
     JA Lanesboro Jct. photo
     Jacks Mt Union photo photo photo
     JN Jefferson Jct. photo
     JS Jersey Shore photo 
     JU Bethlehem photo 
     JU Lebanon photo 
     K Lock Haven photo 
     Kase Sunbury photo
     KI Jenkintown photo photo photo photo
     KW Kenilworth photo
     Landisville(NV) photo photo 
     Leetsdale photo 
     Lehighton(HI) photo photo 
     Lewis  Lewistown photo 
     LV Bethlehem photo
     Marcus Hook photo
     Mattes Street Scranton photo photo
     MB Morris photo
     MG photo photo
     Mifflin photo photo photo
     MJ (Minooka Jct.) photo
     MJ(Potts) Pottsville photo photo photo photo photo
     MK McKeesport photo
     MO Cresson photo photo photo 
     MO Mill Hall photo
     Molly Molly photo
     Morris Morrisville photo
     MR Montour Jct photo
     MR Starucca photo
     MS Corry photo
     Mt Airy photo
     MU Milton photo photo
     MY Myerstown photo
     MY Nanayunk photo
     N Erie Ave. North,Philadelphia photo
     NA Hawley photo
     N Northumberland photo
     NB New Brighton photo 
     NC Newberry photo 
     NE North East photo photo photo photo photo
     North Philadelphia photo photo photo
     NQ Norristown photo
     NQ Erie Ave.(Philadelphia) photo photo photo photo
     NS Norristown photo
     NY Stoney Creek photo
     OA Newcastle photo
     OJ(East Penn Jct.) photo
     Oley Reading photo photo
     ON Olive photo
     Overbrook photo photo photo
     Paoli photo photo photo photo photo photo photo 
     Park Parksburg photo photo photo 
     Parkersburg photo
     Penn Haven Jct. photo
     Pennsylvania AV Pittsburgh photo photo
     PG(Perry)Kennywood(Pittsburgh) photo
     Pine Grove photo
     PK Park Jct. Philadelphia photo photo
     Plymouth photo
     PN Phoenixville photo
     PO Beaver Falls photo 
     Port Newport photo
     PQ Nesquehoning photo photo photo
     PW Abrams photo
     Q Hyndman photo
     R(CNJ) Allentown photo
     R(PRR) East Pittsburgh photo
     RA Reading photo photo
     Redpen Catawassa photo
     RF Cayuga photo
     RF Royersford photo
     RG Jeanette photo
     RJ(Eastwicks)Philadelphia) photo
     Rochester(RC) photo photo photo photo 
     Rockville photo photo photo photo photo
     Rose Altoona photo 
     RS Richards photo 
     RV Herndon photo  
     S(DL&W) East Stroudsburg photo photo photo photo
     S(RDG) Sinking Spring photo
     SA Sand Patch photo photo photo photo photo photo
     SG Johnstown photo
     Shore Philadelphia photo photo photo photo photo
                                photo photo photo photo
     SJ Standard Jct. photo
     SJ Stowe photo
     Slope(BO) Altoona photo photo
     SO photo photo photo photo 
     South Altoona photo 
     Spruce Spruce Creek photo photo
     SR Leesport photo
     SR Susquehanna photo photo            
     Slateford Jct. photo
     SN Heaton photo
     Steel Bethlehem photo photo 
     Sunbury photo
     SY Neshaminy photo 
     SZ Trafford photo 
     TCS Washington photo photo
     Thorn Thorndale photo photo photo photo photo photo
                             photo photo
     Tobyhanna photo
     Thornton Jct. photo
     Tyrone photo 
     U Phoenixville photo photo
     UG East Mahoney Jct. photo
     UN Gallitzen photo
     UN New Castle photo photo photo
     Union St. Allentown photo
     UY Aspinwall photo photo
     VA Caln photo
     VA Irvineton photo
     VA Vista photo
     Valley Jct. Reading photo photo
     VI Brilliant Jct. photo
     View Duncannon photo  
     VO Butler photo 
     VO McElhatten photo 
     Wagner Carnegie photo photo
     Wallace Jct. Girard photo
     Wawa photo
     WC Spring City photo
     WD Wildwood photo 
     WD Windsor photo
     West Conway photo
     West Falls(FS) Philadelphia photo photo photo
     West Henryville photo
     WH(Greene Jct.) Connellsville photo
     WI Brockway photo
     WK(CNJ) Allentown photo
     WK(PRR) Swissvale photo 
     WM West Milton photo
     WN Wandin photo 
     Wood Homewood Jct. photo photo 
     Works  Altoona photo photo 
     WS East Butler photo    
     Wye Hollidaysburg photo photo   
     X Philadelphia photo 
     XC Erie photo
     XD Cloe photo
     XN Shenango photo photo
     YD Ararat photo
     YM Glenside photo photo
     York photo photo photo
     Zoo Philadelphia photo photo photo photo photo
 
Home
INTRODUCTION
CREDITS
OVERVIEW
SITE NAVIGATION
INTERLOCKING MACHINES
TOWER NAMES AND CALL LETTERS
STATES  A-W and  CANADA
ILLINOIS
INDIANA
OHIO
PENNSYLVANIA
UNKNOWNS
RESTORATIONS
NEW TOWER POSTINGS AND MISC BS
LINKS
OPERATORS HALL OF FAME
ABBREVIATIONS & GLOSSARY
LOCK & BLOCK TOWERS
TRANSIT & ELECTRIC LINE TOWERS
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