Tim Gilbert <tgilbert@...>
Frank Brua wrote:Ben Hom replied:
According to their class card diagram, all cars in B&M's #71000-72999 series including 1,975 single sheathed with Pratt Trusses, and 25 steel sheathed had distances between truck centers of 31' 3" versus the X29's 32' 3". The 31' 3" distance was the same as the USRA boxcars, and the 1924 AAR standard single and double sheathed designs,. The 1932 and 1937 AAR Designs' distance between truck centers was 30' 8 1/2" .
Incidently, B&M's #71000-71999 series were built at Standard Steel's Baltimore Plant while the #72000-72999 series was built at Standard's Hammond IN Plant. Accordingly, there were differences when built between the 975 single sheathed #71000's and 1,000 #72000's including doors, door hardware, roofs, trucks and stenciled slogans.
The Baltimore-built 25 steel sheathed #71000's used the drawings of B&O's M26 class; thus were the same including the "50-ton" Duryea underframe except for doors and trucks (the B&O used 50-ton trucks while the B&M used 40-tonners).