Help ID reporting marks for 1934 tank car

A&Y Dave in MD

As I'm transcribing the SR Winston-Salem train conductor's book from
1934, some reporting marks are giving me trouble. This one I have
not been able to resolve after consulting with William Edson's
"Railroad Names" and my digital version of the 1935 ORER I purchased
from Mr. Westerfield.

?N?X might be INSX or TNSX? Tank car #844 carrying
"Extract" to Potomac Yard.

Attached is a PNF format image file (INSX-entry.png) of the scan of
two entries which contain the reporting marks and other information
I'm trying to decipher. Any help?

Dave Bott

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