What in the world?

Well, I have no clue as to how to describe these so maybe you can help.

I have heard them described as “droids.” I have heard that they are slugs. But, what are they?

RCPHE4

RCPHG4

RCPHG6

There was a thread about this a while back-

http://www2.trains.com/community/forum/topic.asp?TOPIC_ID=10290

The thread indicates that they are basically de-engined and de-motored shells set up as remote control receivers in yard service for whatever is MU’ed to them. UP also has a small fleet of them in the UPY 100 series. They are painted solid gray with red lettering.

Okay, now I get it. Thanks.[tup]