Turntable Question

[Anonymous]

On some turntables, I have seen a structure over the turntable track in the center of the turntable, which would go over the locomotive. Does aybody know what this is and what it is used for? Any help you can give me would be most appreciated.

Sincerely,
Daniel

[ndbprr]

If you mean the arch most turntables are run by geared down electric motors at one or both ends and need a source for power. The arch supports a big set of commutator rings that allow the turntable to turn without getting the cable all wrapped up. the control house can vary by railroad but can either be at the center or on one edge where it is easier to line up tracks.

[nfmisso]

QUOTE: Originally posted by trainjunky29

On some turntables, I have seen a structure over the turntable track in the center of the turntable, which would go over the locomotive. Does aybody know what this is and what it is used for? Any help you can give me would be most appreciated.

Hi Daniel;

We are assuming that the structure you are referring to is like the one in the second picture on this site: http://www.bowser-trains.com/hoother/ttables/ttables.htm.

[randybc2003]

That's for "modern" turntables. On small (60' or less)"old" turntables for small locos, which were made of wood, this was a part of the structural frame. the track was "hung" from this center frame w/ steel rods. The wood framing rested on the turntable's piviot race, which bore the load. These small tables w/ this frame were called "gallows" turntables. These turntables were turned by muscle power, and also called "Armstrong". Look up Sothern Pacific narrow gauge, etc.

[Anonymous]

Dear ndbprr, nfmisso, and randybc2003,
Thank you very much for your replies.

Sincerely,
Daniel