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[quote]QUOTE: Originally posted by douort Jarrel, I have a Woodland Scenics precast tunnel portal (stone) laying around and I measured it for you. Outside, overall width is 8". Height is 5-1/2". The opening is 4-5/8" wide and 4" high at the top of a slight arch. Hope that helps. Doug [/quote] Jarrell, Sorry, if I mislead you on those dimensions. My WS portal was in an unmarked box and I didn't pay any attention as to whether or not it was single or double track. It looks a little wide for single track so it could be a double. The NMRA HO track guage indicates you should have 2 1/16" clearance for a single track (side to side), so my original dimensions must have been for a double-track portal. Doug
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