How long did it take for the freight elevators to traverse 1 floor of the TSBD?

[Bill Chapman]

But the elevators as they were on Nov 22nd 1963, might not have been operating at the same pace as they were when originally installed (just like horses escape from a cars engine).

The online document "The Ups and Downs of the TSBD" does not cover the speed of the elevators. Does anyone know any document that has researched these freight elevators in detail?

I read somewhere that in 1963 a new elevator was installed from floors 1-4, meant for office staff

[Colin Crow]

I read somewhere that in 1963 a new elevator was installed from floors 1-4, meant for office staff

Yes, and the passenger elevator in the NE corner was twice as fast.

[Colin Crow]

I found my algebraic workings from some years back regarding determination of the various timings provided in WCD5 provided here....

https://www.maryferrell.org/showDoc.html?docId=10406#relPageId=123&tab=page

I was in error in my recollection earlier in the thread.

Time for the passenger elevator to come up 4 floors = 19 seconds  down was 13 seconds         
The freight elevator up 5 floors was between 36 seconds - 38 seconds. Just over 7 seconds per floor.
Time to travel 5 flights of stairs was 33 seconds......ie a bit faster than taking the elevator.      

[Colin Crow]

I found my algebraic workings from some years back regarding determination of the various timings provided in WCD5 provided here....

https://www.maryferrell.org/showDoc.html?docId=10406#relPageId=123&tab=page

I was in error in my recollection earlier in the thread about the speed of the freight elevator.

Time for the passenger elevator to come up 4 floors = 19 seconds  down was 13 seconds....ie.faster than the freight elevator.         
The freight elevator up 5 floors was between 36 seconds - 38 seconds. Just over 7 seconds per floor.
Time to travel 5 flights of stairs was 33 seconds......ie a bit faster than taking the elevator.