Ok, I think I found a much faster solution.

1. On the Time Slider, set the time to go from 1 to (let's say) 200.

2. Createa vertical railing (aka NURBs cylinders).

3. Draw a curve to represent where you want the railings to run.

4. Select the railing & the curve, go to Animate -> Motion Paths -> Attach to Motion Path.

5. With the railing selected, go to Animate-> Create Animation-> Snapshot ->options.

6. Set the Time Range to Time Slider and Increment to whatever value (let's say 5).

7. Hit the Snapshot button.

8. There will be railings creating now on the curve at almost equidistant.