This model is the often found on station exits and entries on the RhB. This signal is used for clearing the way when there are speed restrictions on the way ahead as well if there is a signal ahead with either speed restrictions or potentially no right of way. The model is 100% metal (brass) and has a height of 9 1/16" and is equipped for the main signal with a green, red, and yellow light and for the approach signal with two green and two yellow lights. It can be connected to 12-20V DC or AC, and can either be operated manually or automatically. We recommend ZIMO decoders for DCC operation. Also this signal can be automatically controlled by our MasterLine
switch drives.

Compare this with LGB-51950, you get a combination signal for the price of a simple 2 bulb signal