Re: Chalk Marks Question

Brian Carlson

We use railroad chalk and keel, the smaller oilier marking material someone asked about, in bridge inspection to make notes on the structure for reference and photos. 
Keel is longer lasting and is sometimes still visible a year later. 

Brian J. Carlson 

On Nov 9, 2018, at 4:31 PM, Bob Chaparro <chiefbobbb@...> wrote:

Chalk used by the railwoads came in very large sticks, 1" in diameter and 4" long.

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