Was Vice President Schuyler Colfax unable to do railroad work because he was color blind?

From: "Tim Elkington" tim@elkington.net

Was our forebear Schuyler Colfax color blind – and therefore left the Railroads??

We always thought that he was unable to do railway work because he was color blind – and therefore ended up Vice-President!!

He was a great friend of my g/g/father – Daniel Witter of Denver. ...

—Tim

This is me, above.