O-36 and that was a big step up for me to graduate from O-27 in high school. I finally got access to all the fun O-31 trains. This was before Lionel made Fastrack in O-31, so I went straight from O-27 to O-36. I have an O-72 wye switch for sidings. I'm a fan of the big steam but unless it comes in Lionmaster, it's not much use to me.
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