Here's the entry for possibly the same drawing at DPL but may be a little cleaner, don't known where you got yours, may be identical...
[
eadsrv.denverlibrary.org]
Equipment drawings - 6th;FFC16;Sf3;OVFF113
Standard Guage Low Flat Car for Shipment of Narrow Gauge Engines - 3664 - C-420 - October 10, 1890
In the "C-420" designation the C stands for car and the 4 means it's a large-ish drawing, so may be better.
Mike McKenzie
Frankfort IL
K-36 t-shirts: [
www.cafepress.com]