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My friend, you did a great job explaining thank you

Keep the green light shining.

It would have been good to find and show an example that is in service. You are right about how the flanges move through he spring frog point, but without the frog guard rail that is always installed opposite the spring frog to catch the backside of the opposite wheel that keeps the flange from 'picking' the spring frog point and causing a derailment..

I used to work for Canadian National. The CN main line, through Northern Ontario, is single track, with periodic double track sections where trains can meet. Spring switches were used to send the trains onto the appropriate track and then they'd open the switch, against the spring, at the other end. I was almost 50 year ago when I work in Northern Ontario and became aware of these switches. And yes, I meant meet. Trains were scheduled to meet opposing trains at specific double track sections and were not allowed to proceed until the opposing train arrived. IIRC, those switches were marked with an "SS" sign beside the switch.

Thank you for posting a video showing just how terrible a ported barrel G21 conversion is! Clearly .460 Rowland stopped selling them for a reason and as annoying as the muzak is, seeing the outrageous recoil of that thing confirms how little "compensation value" is added by the ported barrel versus a real muzzle brake. So FEW understand HOW a muzzle brake works and that ignorance is fed by a swam filled with know-nothing experts and metooers who chime in with idiot comments like, compensators work more by the added weight than anything else. This is also why people get snookered by the ported barrel option which does something, just not what a true brake does. A proper brake has baffles inside against which expanding muzzle gas impinges forcefully to push the barrel forward before being swirled around proper chambers to be ejected upward thus removing gas from the stream going forward, further reducing back-push, and of course "thrusting" the muzzle downward. "Kick" is reduced because more energy is "gone" from the system before the slide ever unlocks. But brakes work best with HIGH pressure cartridges which is why when attached to .45ACPs they do pretty much nothing BUT add weight. They require high pressure, from large charges of slower burning powders that extend the pressure cycle toward the muzzle, and of course this is ideal for magnum power cartridges but of little value to tiny, fast-burning pistol charges in most handgun ammo. That IS the basic "genius" of the .460 Rowland that goes unnoticed by all the spring-changers out there who are shooting oversprung conversions with other negative tweaks and wondering why the guns won't feed! A ported barrel has nothing more than the tiny thickness of the barrel to act as baffles which adds up to pretty much nothing. The first thing you need to do to that gun is get a threaded barrel with proper muzzle brake and that recoil impulse will go WAY down!

Interesting… I always thought a lot of those were moveable point frogs, or raised frogs

Thank you, for this excellent explanation!! I was just reading the Environmental Impact Statement that was written, back in 2011, in preparation for the Charlotte LYNX Blue Line Extension light rail project. In the noise mitigation strategies, the report suggested spring-frogs near two UNC Charlotte buildings that would be sensitive to noise and vibrations. I can see, from your explanation of the required machining and labor time, why this type of frog would be more expensive. But I can also understand, now, how this type of frog would reduce the wheel squeal noise. Thanks!

That beat is 🔥

thank you

What is the intent or advantage of this style frog as opposed to a conventional frog?

Awesome history.

Lose the music man

I was wanting to actually see a PF45 polymer 80 in 460 Rowland. Been thinking seriously about. Did you have any real hiccups with the build that you could share. Thanks for the video.

Do you have trouble keeping the reflex on the slide?

Music ruined the video, just letting you know

Why are there springs involved if the switch points are moved back and forth by a Manuel switch lever?

when was this video made? Going by the paint schemes I guess the 1970s.

Here's a short clip of a spring frog in action. th-cam.com/video/oWIB2iF6ld4/w-d-xo.html

These rail design are very interesting. 🧐

Great lovely boss

I'm curious?? Were the spring frogs designed to allow for higher train speeds on top of a smoother ride??

If that coolant is ms12106 you spent more on coolant that uve used than the conversion kit for the gun

Gunfire is better that this music...