This hand-colored postcard claims to show the eastbound Oriental Limited ascending west towards the Great Northern’s old Cascade Tunnel. To reach the tunnel, which opened in 1900, the old line made a 180-degree turn at Scenic (the site of a hotel and hot springs), traveled west for several miles, then made another 180-degree turn in the Horse Shoe Tunnel near Martin Creek.
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One problem with this picture is that the Oriental Limited was scheduled to leave Seattle in the evening, so it would have been dark by the time it reached this point. It is more likely that this is train number 4, the Fast Mail, which left Seattle in the morning and reached Scenic in early afternoon.