Will a PS/2 locomotive and a PS/3 locomotive work together correctly in a lash-up (consist)

Yes, because MTH generally tried to make true scale MPH as indicated in DCS accurate.

Nothing special- this is just an advantage of how MTH designed DCS, but more so- the effort in making engines accurate matched true speed- avoiding the conflict as seen with L engines and their speed steps.

NO, nothing special required. This is pretty basic.

@Pat Shediack posted:

Will my older FP-45 work in tandem with the new PS/3 version in a double-header locomotive consist? So easily- ANYONE can pull this one off with no skill or special knowledge required. MTH DCS (PS2 and PS3) engines use tachometer encoding with wheel size and gearing to follow accurate scale MPH as indicated or commanded by DCS. If you lash up the engines (any DCS PS2 or PS3) and command them to a speed- they both go the same speed- that simple.

What would I need to do or need to have a dealer do so they will work together properly? Jack squat. Already factory "baked in" by design.

Do I need to do anything with those two TIUs and AIU to update them to work with PS/3 locomotives? Again, NOTHING is required. The last DCS firmware update was 6.1 before I even joined the hobby in 2018. Even older versions could run PS2 and PS3- there is no difference to DCS. Ideally, you should be on the latest update, but you may already be there.

Video of the process https://youtu.be/Ld0Nk_qAP-4?si=Vdz8EkxK3GVBNGiJ

https://www.youtube.com/watch?v=R59wXHoQIrI

Another feature- "ALL engines" https://www.mthtrains.com/site...niques_Article_7.pdf

Thank you for the quick and informative respones!

Vernon is correct it should work pretty well. There are a few things that sometimes misbehave with PS2 +PS3 MU consists (lash-ups). For example, sometimes one of the engines diesel or chuff sounds will turn off. It’s easily remedied by selecting the muted engine in the remote and adjusting its volume back up.

Another thing I find helpful is after making changes like that, make sure you hit the FSV button (after selecting the consist again). This ensures the settings carry forward to your next operating session.