Six Seconds in Dallas-- Old book, a must read

[Michael Carney]

I recall reading that two men were seen up on the 6th floor of the TSBD and they had olive skin. I have only read that one time in all of the books I have read on the subject. Also could have been from the Dal Tex Building, another shooter that is. No, people at street level would not smell the gunpowder from that high.

[Marjan Rynkiewicz]

    If You are going to claim it took the hauling arse JFK Limo 2 Minutes to reach the overpass that stretched across the Stemmons Fwy On-Ramp, are You also then claiming the JFK Limo STOPPED?

Yes, Officer Brown said that the motorcade stopped for at least 30 sec on the onramp.
Confirmed by Hoffman.
So, the motorcade would have taken say 60sec to reach Officer Brown on the railway overpass.