|
Hope everyone in the Northeast is staying warm and dry!
Great day for running trains - my BNSF big guns came out to haul a monster tank train...
It works on O54.......just barely, but it works......1st operating session with a milk train.....
It looks and sounds gorgeous! Looking forward to running it on the modular layout with the O72 and O81 diameter curves.....
Peter
Great pictures guys, really gets the ol' juices flowing.
Putnam Division posted:It works on O54.......just barely, but it works......1st operating session with a milk train.....
It looks and sounds gorgeous! Looking forward to running it on the modular layout with the O72 and O81 diameter curves.....
Peter
WOW! Looks and sounds terrific Peter!! Congratulations on your new locomotive!!
Can someone tell me what this is?
John, it is a snifter valve. I always wondered why the models have them painted gold. As seen on the 460, the valve has perforated sheet metal, which is brass on the 460, don't know if it was always brass. But it would get blackened dirty so. .
I suppose that behind that brass there is a sprung plate that is pushed outward closed when steaming, and pulled open by the vacuum when drifting.
I specifically took that pic and cropped it to a close up because I had just learned of its function as well.
From Wikipedia:
When the driver shuts off the steam to the cylindersof a steam locomotive while it is in motion, the moving pistons could create a partial vacuum in the cylinders. This would give rise to two problems. Firstly, the pumping action would absorb energy and prevent the engine from coasting freely. Secondly, when the exhaust valve opened, soot and cinders from the smokebox could be sucked down the exhaust pipe and into the valve chest or cylinder, causing damage. (The exhaust is open to the smokebox because in normal running the exhaust steam is sent through the blastpipe to draw the fire and eject the combustion products from the chimney.) These problems are avoided by using snifting valves to allow air to be drawn into the cylinder. On railways which did not use snifting valves, drivers were instructed to keep the regulatorslightly open when coasting to avoid the creation of a vacuum.
Access to this requires an OGR Forum Supporting Membership