Hello Chris,
If you mean the passenger cars in the photo I posted, I think you mean curved ROOF vs. curved SIDES. These are Lahaina, Kaanapali & Pacific (not Kauai) coaches. They were built up from White Pass & Yukon Route flatcars.
The Lahaina, Kaanapali & Pacific R.R. has ten former White Pass flatcars: ##1143, 1149, 1151, 1155, 1159, 1160, 1171, 1176, 1177, and either 1175 or 1187. Six of these flatcars have been built up into passenger cars: WP&YR #1159 = LK&P #105 (Aloha Coach); WP&YR #1171 = LK&P #106 (Kaanapali Landing); either WP&YR 1175 or 1187 = LK&P ##104 (1st Willis B. Kyle); WP&YR ##1151, 1155, and 1160 are in unknown correspondence to LK&P 107 (2nd Willis B. Kyle), 108 (Kahekili), and 109 (A. W. “Mac” McKelvey).
One former White Pass flatcar is in work service: WP&YR #1143 (the only 30-ft. flatcar; the other 9 flatcars were 35-ft.). The remaining three former White Pass flatcars are stored: WP&YR ##1149, 1176, and 1177.
##1143, 1151, 1155, 1159, 1160, 1171, 1177 from: Marzec, J. D. (2019). “Re: White Pass Flatcar 1181?” Narrow Gauge Discussion Forum (May 1, 2019), at, [
ngdiscussion.net] . ##1149 and 1176 from examination of photos & WP&YR equipment rosters. “#1175 or 1187” from the presence of a two-compartment “AB” brake reservoir under #104 & examination of the January 1, 1982 WP&YR equipment roster (only about 25% of the 1100-series flatcars had AB brakes).