In 1935, class B1 #219 had an unfortunate encounter with a loaded logging truck that failed to stop, look, and listen, and even though there were miraculously no fatalities the front cab was pretty badly crumpled and needed to be cut off and replaced with a new one.

The streamlining craze had a pretty good hold on the railroad business at that time and the Portland shops were not immune to this craze, so they rebuilt #219 with a new cab that was strongly influenced by Union Pacific M10000 & M10001 and modern automobile design.

The drawing doesn’t show it, but there’s a lot of metal forming making that stub nose curve like the UP units, and unlike the UP units #219’s cab was made from steel plate. So this was the last streamlining on a class B until the class E was introduced in 1967 with EMD-alike cabs.

And #219? it ran another 45 years before being retired, then donated to the NRM as an example of pre-WW2 streamline design.