Whenever EMD or GE roll out a new unit, the prototypes almost always wind up on the Moffat Tunnel Sub. Why? It is the highest active standard gauge mainline in the United States, and it is loaded with tunnels. This allows for both high altitude testing and tunnel performance testing. EMD's Tier-4 compliant SD70ACe-T4 is no exception. Here, a special train escorts two such prototypes and an EMD test car west on the Moffat.
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