Legacy/TMCC Lashup

Not sure why The TMCC engine has to be in the lead but the Legacy engine will have to be addressed in TMCC mode and the TMCC engine needs to have Odyssey control. Cruise engines don't play well with non cruise engines. Also not sure two different types of engine will run together like an diesel with a steam engine or two steam engines with greatly different driver diameters.

My only experience with this is running an Odyssey L2a Mohawk with its Legacy brother. These do run fine together.

Pete

I'm guessing it has something to do with the fact that the Legacy system has more speed steps than TMCC: 200 versus 32. It's 'easier' for the Legacy locomotive to match the speed of the TMCC locomotive than the other way around. Hopefully someone who knows for sure will chime in...

Because the lead engine sets the type of the lash-up.  TMCC locomotives will not do anything if Legacy signals are sent, but a Legacy locomotive will follow TMCC commands.  With a TMCC locomotive in the lead, TMCC signals are sent.  If lead locomotive is a Legacy locomotive, then Legacy signals are sent.  I have never tried it personally, but I do not believe when building a lash-up that the Legacy locomotive will maintain it's TMCC control setting you gave it under the engine information as Legacy treats TR and ENG independently, and you can't set a TR control type.

If you are using a Cab1/Command Base both engines get TMCC signals. If you are using a Cab2/Legacy Base then you have make sure the Legacy engine is in TMCC mode. Location in the consist makes no difference. Neither engine knows what the other is doing. To verify if a lashup will work just put them on the track a uncoupled a few inches apart and start them up in lashup mode and see how close them run together. If the distance changes by more than 1/2" per foot you will be stressing their motors and traction tires.

Pete

Sinclair & Pete,

So, the situation is as follows for mixed Legacy/TMCC lashups to operate properly using any controller other than a Cab-1:

• Option #1: Legacy engines all in Legacy mode and a TMCC engine must be the lead
• Option #2: Legacy engines in TMCC mode and the order of Legacy or TMCC engines doesn't matter.

Barry, TMCC engines will not operate in Legacy mode, but Legacy engines will operate in TMCC mode and like Barry said you have to run them uncoupled to make sure they are compatible for a lashup.

I have two engines that have ERR boards and can only run in TMCC however, when I tried to do a lashup one engine was a little quicker than the other and that caused stress on the motors and traction tires on the slower engine. So I did the test that Barry described and they moved apart 1/2" per foot. At the time I didn't know about the 1/2" per foot. I just knew they weren't going to lashup.

Denny, you do know about the ERR Cruise "nudge" feature, right?  That is designed to allow you to tweak the speed curve of an individual locomotive so it will run with others.

Funny, no one from Lionel has answered your question. The Legacy has back drivable gears and TMCC does not, I wonder if that is a factor in location.  Not sure that it should but???  G

Besides whats been posted above, If I remember right Jon from Lionel stated that Legacy engines have back driveable gearing which allows them to run together without fighting each other.

Doug

Barry, Option # 2 is correct.

Jim D

trnluvr posted:

Besides whats been posted above, If I remember right Jon from Lionel stated that Legacy engines have back driveable gearing which allows them to run together without fighting each other.

Doug

Not all Legacy locomotive do, the B6sb being one that doesn't.  But I wouldn't rely on the back driveable gears for locomotives that are noticeably different speeds.

I've run across several Legacy locomotives that don't have back driveable gears, that's not a certainty.  I think the recent M1a may be another without them.

Guns,

  Now that would be a bummer!

PCRR/Dave

Pine Creek Railroad posted:

Guns,

  Now that would be a bummer!

PCRR/Dave

Don't you mean "is a bummer"?

JD is correct. Option 2

Barry you are correct.  If the first engine is TMCC the "lash up" will run in TMCC mode and the next engine will operate in TMCC - even if it is a Legacy.  If the 1st engine is a Legacy set to Legacy mode the 2nd engine - if TMCC - will not operate.  To run the Legacy-TMCC "Lash Up" with a lead Legacy engine set the Legacy to TMCC mode for the "Lash Up" while running the Lash up.  So either engine can be in the lead but the Legacy engine will be in TMCC mode either automatically or with your manual set.  Bruce