Are you familiar with a moveable point frog as it related to a switch (turnout)? Most switches have a frog that is a single piece of steel with groves for wheel flanges. However, in situations where the turnout needs to support higher speed and/or it needs to support heavier trains, railroads will sometimes install a moveable point frog. Similar to the standard switch point, a moveable point frog requires a second turnout motor and it moves the frog back and forth, create a far smoother (and safer) turnout for heavier trains at higher speeds. This particular moveable point frog is located at CP DS007 (Arvada). When UP added a second main track between C&S Junction and Arvada, the added this turnout for coal trains.
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