Matt --
Found it.
It's "O_Gauge_Track", kuid 46819:38196
There's also:
'1_Meter_O_Gauge_Track', <KUID:46819:38198>
'O_45_Degree_Crossing', <KUID2:46819:17002:1>
'O_15_Degree_Crossing', <KUID2:48619:17003:1>
'O_90_Degree_Crossing', <KUID2:48619:17001:1>
And if you want some
animated O Gauge switches:
'O_Right_Switch', <KUID2:46819:17005:1>
'O_Left_Switch', <KUID2:46819:17004:1>
'O_Left_38_Degree_Switch', <KUID2:46819:17006:1>
'O_Right_38_Degree_Switch', <KUID2:46819:17007:1>
But you'll need:
'JJS_Invisible_Track', <KUID:46819:38199>
And if you want to continue the Lionel theme:
'O_Gauge_Bumper', <KUID2:46819:24018:1>
'Low switch stand l', <KUID2:118781:28010:1>
'Low switch stand r', <KUID2:118781:28011:1>