I think the new O-100's work great, actually their not so new now. The old regular Gargraves have some issues with large steam locomotives such as a SP GS4 or any of the scale 3rail Northerns or Mountains. I don't think Gargraves ever gave an official radius or diameter of those switches which were approximately O-72. They have been around since the sixties I must have sixty of those and they work fine with "toy scale" locomotives and most diesels. Still usefull in yards and city scapes. But to the point I think the new O-100 are fine and if I ever get my basement cleared out have about 30 of them and plan to use them exclusively on mainlines. Back in the eighties after my divorce my layout ended up over in my brothers basement at some point we tore it apart and built an around the wall layout with the track but in the late eighties when lionel came out with the Reading T1 and the NYC Mohawk they had trouble going through the old Gargraves swiches so when the O-100 came out in the 90s we swapped the old switches out for the new O-100s. j
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