Curtis,
The builders numbers for the Sumpter Valley Baldwins constructed for the railway are as follows...
Number 16, 42073
Number 17, 42074
Number 18, 42815
Number 50, 42865
Then there are all the other Baldwins if you're interested in looking as well...
Number 285, 4982
Number 1, 19211
Number 2, 19210
Number 3, 5695
Number 3, 9519
Number 4, 4982
Number 4, 24689
Number 7, 5164
Number 8, 5930
Number 10, 5285
Number 11, 4429
Number 11, 5930
Number 14, 28806
Number 15, 11075
Number 250, 59621
Number 251, 60470
Hopefully at least a few of the plans for these locomotives show up.
See You Soon, Taylor