Where can i get replacement joiners for HO curves and straight tracks
They sell them at most hobby shops, check your LHS (local hobby shop/store), or I guess you could buy them just about anywhere online, but there really is no need.
Dear Usher42,
Most just replace them with Atlas #170 HO rail joiner - 48 per package.
By the way, Bachmann HO track doesn't have 11.25" radius curves, but Bachmann's N scale track does.
Bachmann HO track does have 22" radius curves, 11.25 degrees (= half curve, #44532)
Hope this helps.
Sincerely,
Joe Satnik