All I could find was this FB info:
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Facebook
The official "Great American
Rail-Trail®" guidebook from the Rails-to-Trails Conservancy
(RTC) is available for pre-order, scheduled for release on May
19, 2026. The guide covers 50 featured trails along the
3,700-mile cross-country route from Washington, D.C., to
Washington State, including key experiences, maps, and trail
details.
Release Date: May 19, 2026.
Price: $19.95.
Features: Details 50 trails,
maps, and, can't-miss experiences along the 3,700+ mile route.
Pre-order Location: You can
reserve your copy at the AdventureKEEN Shop or RTC Shop.
The guidebook is designed for
planning trips along the emerging 3,700+ mile route, which is
currently over 55% complete, connecting DC to Washington