Summary

Vincent Francis Seyfried The Long Island Rail Road: A Comprehensive History…

In January, 1874, eight passenger cars were purchased from the United States Rolling Stock Co.
Car #32 burned up at Hempstead depot on December 1, 1873, the fire in the stove accidentally igniting the woodwork.
Car #20 mentioned June 29, 1874.
Descriptions
"A stove, which is in one corner of the car and enclosed for safety by an ornamental iron closet, furnishes hot air to iron pipes, which coil under the seats throughout the cars and serve to keep passengers' feet warm in any location and any weather. The stove closet is kept locked and is in charge of the brakeman.
Source: Wikisource

Vincent Francis Seyfried The Long Island Rail Road: A Comprehensive History…

Eaton, Gilbert & Co. of Troy, N. Y. Six passenger cars, built 1853, two seating forty to sixty passengers and four seating sixty or more.
Cummings Car Co. of Jersey City, N.J. (?) In July, 1866, the newspapers record the arrival of "several splendid passenger cars", added to the New York & Flushing R.R. "within the last week."
Flushing, North Shore & Central R.R.
Although the cars of the Flushing, North Shore & Central R.R. are hardly more numerous than the engines—only about thirty-two in all—our records of them are far more fragmentary.
Source: Wikisource

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