[HE PENNSYLVANIA RAILROAD.

world, is seen on the left. This bridge, which is a succession of
forty-eight stone arches, is three thousand eight hundred and
thirty feet long, fifty-two feet wide, with four standard-gauge
tracks, and required: in its construction two hundred thousand
tons of stone. From this point on, until the culminating grandeur
of scenic wildness is reached at Allegrippus, 150 miles to the
west, the scenery is a constantly changing picture of forestcrowned
 mountain, picturesque foothills, deep-shaded valleys.
and sparkling streams.
“eaving the Susquehanna in the distance, the line takes its
:ourse along the Juniata River, and clings to the meandering
banks of this romantic stream for 100 miles. crossing and re-THE

 HORSESHOE CURVE

crossing it more than a dozen times. The diversity of the
scenic effects produced by the ever-changing moods of mouncain,
 valley, and stream lends a spice to the trip which seasons
it to the taste of the most exacting lover of natural beauty.
At the one hundred and thirty-first mile-post from Harrisburg,
 Altoona, the mountain workshop, is reached. Here
are located the locomotive and car-building shops of the Pennsylvania
 Railroad, the most extensive railway shops in America.
Altoona has a population of 38,973, all of which draws its
subsistence directly or indirectly from the railroad or its allied
anterprises.
Leaving Altoona, the true ascent of the Allegheny Mounrains
 begins. Five miles to the west is the well-known Horse-