Mixing Track Types

@Scotten posted:

1st question - can all of these track types be used together not considering the turn radius.

Yes. It sounds like you have both Lionel & K-Line O-72 35.88" radius track sections based on your measurements..

@Scotten posted:

Other than the pullmans, what other individual cars should I be concerned about?

If everything is smaller than those, you are good to go.

@Scotten posted:

Also will my 671 engine & whistle car work with the shorter radius turns?

The 671 was engineered to operate satisfactorily on very tight 12.37" radius O-27 track, so you will have no issues anywhere with that.

Assuming that you are talking about tubular track.  K-Link tubular track is the best of the tubular.  It is more sturdy than Lionel,  and it has (to me) a more pleasing spacing of ties.  The two tracks work perfectly together, I have been doing it for years.  The only issue is appearance,  Some might feel that the different tie spacing does not look good together.  I'm OK with it.

Put together circles of track to figure out what you have.  Note the designation of O72 means 72" diameter.

@ogaugenut posted:

...snip... The only issue is appearance,  Some might feel that the different tie spacing does not look good together.  I'm OK with it. ...snip...

To quote someone on a UK forum: "Don't worry, the ballast will hide it.".

@PRRMP54 posted:

To quote someone on a UK forum: "Don't worry, the ballast will hide it.".

That's a LOT of ballast for "O" profile track!