Union Pacific Big Boy

READ:
Running about 3 hours late due to striking a downed tree in North Auburn, no. 4014 powers up the final stretch of 2.0% grade up to the summit at Norden. The engine is accelerating it's consist out of a 10 mph speed restriction at Soda Springs with minimal assistance from the accompanying diesel and puts on quite a show as she enters and exits the snow shed at Norden.

There, we are afforded a rare opportunity to see the clamshell stack hood in action. The stack hood deflector had a dual role, in which it protected tunnel roofs from being damaged by the exhaust plume by defusing and redirecting it rearward, and also protected the crew from getting the exhaust kickback that would otherwise bounce off the tunnel roof, onto the roadbed, and back up into the cab. Enjoy and stay tuned =)

Consist is about 1,550 tons behind the main tender, including the diesel & water cars.

Thanks to NYCTA Railfan for letting me use his footage from this trip. Check out his content on TikTok here:   / nycta_railfan   ‪@NYCTARailfan‬

Full Donner Chase:    • Chasing Union Pacific Big Boy No. 401...  

FAQ (Read before commenting):
The water overflow from just in front of the rear cylinder on the fireman's side is the exhaust steam injector overflow port. Discharge from this port is normal when starting and stopping the injector, and when the injector switches between live steam and exhaust steam.

The diesel locomotive, while no longer necessary for PTC compliance, will continue to periodically be used where it is expedient for steam locomotive fuel conservation and assistance on long, sustained grades (power / dynamic braking).