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Originally Posted by Jdevleerjr:

Fired her up without her valves or pistons installed?    


Yes, initial firing to blow all the collective accumulated junk out of the steam passages, dry pipe, superheaters etc. so that once the pistons and valves are installed, you don't blow all that junk into the packings, rings, seals, and cylinders. All that time and expense spent machining and repairing would be toast within short order. I believe the pink color to the steam around 15 seconds would be rust that accumulated in passages.

Originally Posted by Jdevleerjr:

Fired her up without her valves or pistons installed?    

Note that when the throttle is first opened and blasts out the valves, the steam has a pink hue to it. It was probably more like orange in color in person, but whatever color it was, that coloration is the "junk" in the steam passages being blown out. After the throttle is open for a few seconds the coloration disappears and the steam is white.

 

This is common practice for a locomotive that has had the work that 4501 has undergone in this overhaul.

Originally Posted by OGR Webmaster:
Note that when the throttle is first opened and blasts out the valves, the steam has a pink hue to it. It was probably more like orange in color in person, but whatever color it was, that coloration is the "junk" in the steam passages being blown out. After the throttle is open for a few seconds the coloration disappears and the steam is white.

 

This is common practice for a locomotive that has had the work that 4501 has undergone in this overhaul.

I'm guessing everything and anything downwind of the 4501 got a nice dusting of Iron Oxide.

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