Photo By: Kevin Morgan

AMTK 51 and AMTK 203 lead the eastbound Zephyr through the hotbox detector at MP 22.6 at Blue Mountain Drive. The detector would reveal that the temperature is currently 76°F (25°C), the train approaching the grade crossing. Email Questions or Comments to the Webmaster. User Comments (0) No comments posted yet. Click Here to add the first one!

4 views 0 comments Monday, June 30, 2025 at 6:10:22 PM image date Location Information City or County and State Arvada, CO Subdivision Moffat Tunnel (UP) Milepost or Control Point Detector (MP 22.6) Train Information Railroad Amtrak Model P42DC Primary Unit Number AMTK 51 Paint Scheme Amtrak Phase 5b Symbol AMT6-29 Train Type California Zephyr (Amtrak) Photo Information Camera Make/Model Hasselblad / Mavic 3 / Mavic 3 Pro [L2D-20c] ISO 170 Flash Did Not Fire Focal Length 24 mm Shutter 1/1250 seconds Aperture f/2.8

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