As freight cars grew taller, observing a train from the cupola of a caboose became increasingly difficult. In the wooden car era, another problem with cupola cabooses was sagging roofs. In an effort to solve these problems, the Akron, Canton & Youngstown railroad introduced the bay window caboose in 1923. (In fact, however, bay windows had been used on New York & Harlem Railroad passenger cars as far back as the 1850s, to enable conductors to better anticipate station arrivals.)