▁Park ▁ ▁Some ▁tra ils ▁managed ▁by ▁the ▁U . ▁S . ▁Forest ▁Service ▁and ▁other ▁government al ▁entities ▁may ▁restrict ▁access ▁of ▁horses , ▁or ▁restrict ▁access ▁during ▁certain ▁times ▁of ▁the ▁year . ▁ ▁For ▁example , ▁horses ▁are ▁allowed ▁on ▁the ▁American ▁Disc overy ▁Tra il , ▁which ▁cross es ▁the ▁country , ▁but ▁only ▁on ▁specific ▁sections ▁of ▁the ▁App al ach ian ▁Tra il . ▁ ▁Access ▁to ▁tra ils ▁and ▁path ways ▁on ▁private ▁land ▁is ▁generally ▁left ▁to ▁the ▁dis cret ion ▁of ▁the ▁land owner , ▁subject ▁to ▁the ▁general ▁tres pass ▁laws ▁of ▁each ▁of ▁the ▁ 5 0 ▁states . ▁ ▁Rail ▁tra ils ▁ ▁Rail ▁tra ils / paths ▁are ▁shared - use ▁paths ▁that ▁make ▁use ▁of ▁abandoned ▁railway ▁cor rid ors . ▁They ▁can ▁be ▁used ▁for ▁walking , ▁cy cling , ▁and ▁often ▁horse ▁r iding ▁as ▁well . ▁The ▁following ▁description ▁comes ▁from ▁Australia , ▁but ▁is ▁applicable ▁equally ▁to ▁other ▁rail ▁tra ils ▁that ▁exist ▁throughout ▁the ▁world . ▁ ▁" F ollow ing ▁the ▁route ▁of ▁the ▁rail ways , ▁they ▁cut ▁through ▁hills , ▁under ▁roads , ▁over ▁emb ank ments ▁and ▁across ▁g ul lies ▁and ▁cre eks . ▁A part ▁from ▁being ▁great ▁places ▁to ▁walk , ▁cycle ▁or ▁horse ▁ride , ▁rail ▁tra ils ▁are ▁linear ▁conservation ▁cor rid ors ▁protect ing ▁native ▁plants ▁and ▁animals . ▁They ▁often ▁link ▁rem nant ▁veget ation ▁in ▁far ming ▁areas ▁and ▁contain ▁valuable ▁fl