<p>As the Allegheny Portage was completed, stationary steam engines raised and lowered trains on the inclines while horses pulled the cars on the levels.  A year later steam locomotives, similar to this full-sized model, appeared and by 1850 had replaced horses along the full length of the portage.
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@ Allegheny Portage Railroad National Historic Site
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/44124370018@N01">daveynin</a> from United States
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<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/daveynin/15479631153/">Steam Locomotive</a>