Further construction past the line's initial terminal at Rockaway Avenue was delayed by funding problems due to the Great Depression in the 1930s. This was temporarily solved by federal Works Progress Administration funding starting in 1936. The portion continuing from east of Rockaway Avenue along Pennsylvania and Pitkin Avenues to Crystal Street, including the Shepherd Avenue station, began construction in 1938. The progress lasted only a few years, as all work on the last portions in Brooklyn was stopped by December 1942 shortly after the United States entered World War II due to material shortages. The Broadway−East New York station was complete but not in operation due to lack of signal equipment, and the remaining stations to Euclid Avenue were unfinished shells. At the time, work on the section that included the Shepherd Avenue station was more than 99% complete, but vital equipment had yet to be installed, precluding its opening.