The Baltimore & Ohio Railroad Historical Society is an independent non-profit educational corporation. The Society's purpose is to foster interest, research, preservation, and the distribution of information concerning the B&O. Its membership is spread throughout the United States and numerous foreign countries, and its scope includes all facets of the B&O's history. Currently the Society has over 1300 registered members. Several classes of annual memberships are available:
| Regular: | $35.00 | |
| Regular, Non-USA Resident: | $47.00 | |
| Sustaining: | $47.00 | (includes FREE calendar) |
| Sustaining, Non-USA Resident: | $63.00 | (includes FREE calendar) |
| Student - USA Resident (non-voting): | $20.00 | (Available to persons 17 years old or younger) |
| Student - Non-USA Resident (non-voting): | $30.00 | (Available to persons 17 years old or younger) |
| Associate (Corporate/Business): | $125.00 | |
| Institutional (Non-profit/Press): | $25.00 | |
| Additional fee for Digital copy of The Sentinel: | $10.00 | Members get mailed copy of magazine as part of membership. This option provides both mailed copy and digital download |
Members regularly receive a variety of publications offering, news, comments, technical information, and in-depth coverage of the B&O and its related companies. Since 1979, the Society has published a quarterly magazine, The Sentinel, dedicated to the publication of articles and news items of historical significance and interest to the B&O fan. Members have the option of receiving The Sentinel in hard copy by mail, digital download, or for an additional fee, both media. Our web based Membership Application will give you the option to choose your delivery method. See our Sentinel area for a detailed discussion of this dual media option and how to subscribe. See our eSentinel digital download area for more information on our eSentinel digital download edition. Other Society publications include monographs, calendars, equipment rosters, and reprints of original B&O source material. Their purpose is to make otherwise unobtainable data available to the membership at reasonable cost.
Membership in the Society is a vote of support and make all of the Society's work possible. It provides those interested in the B&O with a legitimate, respected voice in the railroad and historical communities. By working together, B&O fans are able to accomplish much more than by individual efforts. No matter how diverse your interests or how arcane your specialty, others share your fascination with America's most historic railroad.
We invite your participation.
For additional membership information, see our Frequently Asked Questions page.
Are you interested in becomming a member? If so, please fill out our web based Membership Application and send into our Society. It may be filled out on line. Then, you need to print a copy and mail it, along with your payment, to us. The form permits the use of an electronic signature. You may pay by check or money order, or through credit card by filling out our order form through our Company Store. Please sign the application after it is printed. Then, send along with your payment to:
Baltimore & Ohio RR Historical Society
Attn: Membership
P.O.Box 24225
Baltimore, MD 21227-0725
Membership fees when once accepted are not refundable.
Moving? For those who wish to send in address changes via email instead of by Postal mail, just click on this icon 
to send an email to our Society with your address change. Members may also submit address changes by USPS as before. Please make sure you included your membership number, identify your old address, and your new address. If notifying us by email, try and send your change in approximately 6 weeks before your new address becomes effective.
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