Simulate articulated chuff

I suggest trying it, that's the only way you'll know for sure.

@gibson man posted:

So here is my idea:

Take a railsounds 2.5 board...trigger it using two reed switches wired in parallel mounted on two separate axles of a truck...magnets mounted to one wheel of each of the two axles.

Will this trigger the chuff in an increasingly variable rate...or is the triggering too slow to allow a 'double' unsynchronized chuff?

Only "simple" (each pair of cylinders exhausted through the stack independently; a Challenger is a good example of this) articulated had a syncopated chuff, and that even those blended with a bit of speed. "Compound" articulateds (such as the USRA 2-6-6-2) had a "regular" chuff, as the high-pressure cylinders exhausted into the low-pressure cylinders, and only these 2 HP cylinders actually exhausted through the stack.

There is no "articulated" chuff, as such. Depends on the loco.

@D500 posted:

Only "simple" (each pair of cylinders exhausted through the stack independently; a Challenger is a good example of this) articulated had a syncopated chuff, and that even those blended with a bit of speed. "Compound" articulateds (such as the USRA 2-6-6-2) had a "regular" chuff, as the high-pressure cylinders exhausted into the low-pressure cylinders, and only these 2 HP cylinders actually exhausted through the stack.

You have that reversed, i.e. only the LP (low pressure) cylinders exhaust through the stack, such as the N&W Y Class, and those C&O USRA type 2-6-6-2 compound locomotives. However, when starting, a compound articulated will have both the HP and LP cylinders exhausting through the stack.

There is no "articulated" chuff, as such. Depends on the loco.

Yes, it does depend on the specific locomotive, but in general a simple articulated steam locomotive, such as N&W A Class 2-6-6-4, UP Challenger 4-6-6-4, and UP 4000 class 4-8-8-4 locomotives will tend to have the 4 separate exhaust "chuffs" of each pair of cylinders, go in and out of "sync" as they accelerate, or down at slow speed on a hard pull.

The Lionel Legacy Y6B even emulates the startup slow speed chuff and then switches to the different sound at higher speeds.

@gunrunnerjohn posted:

The Lionel Legacy Y6B even emulates the startup slow speed chuff and then switches to the different sound at higher speeds.

I remember Lionel attempting to do that on the N&W Y6b model, but I thought they wound up getting it backwards. That is, the model starts in 4-chuffs and then switches to 6/8 chuffs, which is the exact opposite of how a compound articulated sounds. I seem to remember BigJim discussing that.

I'll have to put it on the rails again, I know it shifts to a different chuff, but you may be right.  Well, it was a good idea at least...

@Hot Water posted:

I remember Lionel attempting to do that on the N&W Y6b model, but I thought they wound up getting it backwards. That is, the model starts in 4-chuffs and then switches to 6/8 chuffs, which is the exact opposite of how a compound articulated sounds. I seem to remember BigJim discussing that.

Let's put it this way, the "JLC" version of the N&W Y6b started off incorrectly in "compound" (fewer exhausts) and then switched to "simple" (more exhausts). They corrected the problem on the latest version.

I have the Legacy version with whistle steam, much later.  I thought it sounded right, but it hasn't been run recently.