I believe they are 2R only.
Items are OK, not OEM quality. The photos I received indicated that they were a little rough.
My friend had a sample of the HO SIRT car and it lacked details plus it was warped.
They are the only cars available closest to what the LIRR ran back in the day.
No one else wants to invest in tooling especially these days.
They can be quite costly per car with cleaning up flashing, painting, decaling, adding trucks and couplers. Then you need a motor car to pull the trailer cars.
So, I’m going with the new / next MTH LIRR MU electrics.
If IMW cars were 3R, I would order some pings to run with the MU’s.
Unless something has changed, that’s the story as of now.
S.