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The following sites have been Ironman approved:
Jon Roma: Good site for dates about closings and razings http://www.jonroma.net/towers/
Dave Haynes: Another good site for towers,lots of track diagrams with signals. http://members.trainorders.com/nkp759/towerindex.html
Dick Carpenter has written four volumes published by John Hopkins University press called: "A railroad atlas of the United States in 1946" Mr. Carpenter has Volume 5,Iowa and Minnesota,out now. They show all the interlockings in service in that year.
Rich White: A good site that focuses on the nuts and bolts of interlockings and signaling. http://www.rrsignal.com
Mike Condren has a site that concerns with railroading in the Memphis Tennessee area. There is a section on towers that will interest you. condrenrails.com
The TrackSide Photographer is another "Ironman" approved site. The focus is not on trains per se but other parts of railroading;bridges,structures,track,equipment. Great site..... thetracksidephotographer.
Harrisburg PA. NRHS has done a great job of restoring Harrisburg tower. Here is the link to their site.
http://www.allaboardwaldwick.org/
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![Home](img/navig/nghp.gif) | ![INTRODUCTION](img/navig/ng1.gif) | ![OVERVIEW](img/navig/ng3.gif) | ![SITE NAVIGATION](img/navig/ng6.gif) | ![INTERLOCKING MACHINES](img/navig/ng5.gif) | ![TOWER NAMES AND CALL LETTERS](img/navig/ng13.gif) | ![SUPPLEMENTAL TOWER MATERIAL](img/navig/ng29.gif) | ![STATES A-W and CANADA](img/navig/ng8.gif) | ![ILLINOIS](img/navig/ng9.gif) | ![INDIANA](img/navig/ng10.gif) | ![NEW JERSEY](img/navig/ng25.gif) | ![NEW YORK](img/navig/ng24.gif) | ![OHIO](img/navig/ng11.gif) | ![PENNSYLVANIA](img/navig/ng12.gif) | ![ABBREVIATIONS & GLOSSARY](img/navig/ng20.gif) | ![LINKS](img/navig/ng16.gif) | ![LOCK & BLOCK TOWERS](img/navig/ng22.gif) | ![MY FIRST TOWER ASSIGNMENT](img/navig/ng33.gif) | ![APRIL UPDATES](img/navig/ng43.gif) | ![MAY UPDATES](img/navig/ng44.gif) | ![JUNE UPDATES](img/navig/ng45.gif) | ![APRIL 2022 UPDATES](img/navig/ng47.gif) | ![OPERATORS HALL OF FAME](img/navig/ng17.gif) | ![TRANSIT & ELECTRIC LINE TOWERS](img/navig/ng23.gif) | ![RAILROAD MAPS](img/navig/ng40.gif) | ![RESTORATIONS](img/navig/ng14.gif) | ![TALES FROM THE TOWER](img/navig/ng26.gif) | ![UNKNOWNS](img/navig/ng7.gif) | ![](img/base/ba.gif) | | If you have any feedback on how we can make our new website better please do contact us. We would like to hear from you.
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