PENNSYRR.COM by Jerry Britton

RW F37

Twenty F37 well pocket flats were built at Altoona in 1942. They had a capacity of 70-tons, were 39'0" long over strikers, and had a pocket well measuring 18'5-1/2" by 6'4-5/8". The cars were constructed of riveted steel plates with a steel plate deck. Five triangular supports on each side added strength. The brake line ran outside of one side of the car. The cars initially ran on 2E-F19 Barrett-Whitehead trucks, though some were later fitted with 2E-F2 Crown trucks.

Cars on the PRR roster (as listed in the Official Railway Equipment Register (ORER)):

Class Car Number AAR Class PRR Oct 44 PRR Oct 48 PRR Apr 52 PRR Oct 53 PRR Oct 58 PRR Oct 63 PRR Apr 68
F37 470060 470079 FW 20 20 20 20 20 20 1
F37a 470040 470059 FW - - 1 14 14 14 4
F37b 470023 470039 FW - - 9 17 17 17 14
Roster data compiled by Rich Orr. From


Types of trucks used

Class Car Numbers Truck Class Truck Name Qty cars:
F37     2E-F19 Barrett-Whitehead  

Truck data is from PRR documents circa 1940's. Other truck classes may also have been used. From



PRR 470061 F37 E13764 081942

Sm PRR470061 F37 blrdsphoto

The F37 has been offered in brass by Railworks.

RW F37Railworks F37 flat car.


Between 1950-53, 31 FN and FNA were rebuilt into 14 F37A.


The F37B were true well hole flats and featured a heavy supporting frame and no floor. Loads had to be fitted into custom wood or steel framing. They were constructed from former FN cars between 1948 and 1952. Length over strikers was 38'4"; the well measured 16'8-3/4" by 7'0". They ran on 2E-F2 Crown trucks.

The F37B were only used when absolutely needed, and were stored at Pitcairn Yard awaiting their next call to service.

The F37B has been offered in brass by Railworks.

DSC09165Railworks F37B flat car.