For most engines built by BLW between 1868-1938, the mechanical specifications sheets/books for individual BLW locomotives housed at DeGolyer Library, Southern Methodist University in Dallas, TX have been digitized and can now be searched online:
http://digitalcollections.smu.edu/cdm4/ ... OX=1&REC=1

K.R. Bell

Actually. they are only part way digitized and on-line. The total holdings are 78 volumes (numbers 5 through 84). The ones listed as available are volumes 5 through 31. Let's hope that they continue to place these digital (pdf) copies of the microfilmed copies on-line.