White Pass & Yukon Route has four cars built by Jackson & Sharp. These are cars 218, 220, 222 and 224.
These appear to have come from the New York railroads, Stony Clove & Catskill Mountain R.R. and Kaaterskill R.R.
See the Wikipedia page:
List of White Pass and Yukon Route locomotives and cars
This passenger car list is a well researched and footnoted table.
It was once reported that these four cars had come from the Los Angeles & Redondo RR. But, the time frame does not match or allow that to be a source.
Brian Norden