The trademark was registered with the Colorado Sec. of State. Here is the information on that registration from the SOS site:
ID Number: 20041256298
Trademark Name: Georgetown Loop Railroad
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Trademark Registrant: The State HIstorical Society of Colorado
Trademark Registrant Street Address: 1300 Broadway, Denver, CO 80203-2137
Trademark Registrant Mailing Address:
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Manner Used: Advertisement, naming, identification
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Status: Exists
Form: TEXT
Goods Services Class: 41
Registration Date: 2004-07-21 13:04:04.0
Expiration Date: 07/21/2014