UP is running their EC-4 test car west over the Moffat today. The test car has a lot of equipment onboard for monitoring and measuring the track. It can detect defects that need to be repaired, among other things. Several years ago, the EC-4 was self-propelled. When it broke down, rather than bother to repair it, UP now simply hauls around the system behind a unit and a flat car! On this trip, the test car is running through every single siding between Denver and Phippsburg on the Craig Branch.
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