While HO trains are half the size of O Guage (actually 1/4 given both the length and height are reduced) they are more accurate to scale and thus they will take up the same amount of space. Passenger cars will be almost as long as O gauge cars as the later were about half the length of what they should have been if they were accurately proportioned. Likewise the curved track has a much shorter radius than real tracks would have. They were designed for play, not for conveying historical accuracy.
This thread is 15-years old. Moreover, the OP has only two posts and has not been back. Time to move on.
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That was always a pet peeve of mine on the old forum. I do like the format of the new forum where old threads are readily available for viewing, but it does encourage replies to old threads, often unintentionally and unknowingly, especially by first time posters. My long-standing suggestion is to lock old threads. Let them be viewed but not replied to. A new thread can always be started with a link to an old thread.
Rich
the arduino forum locks threads after 6 months