LGB
Single Rail Insulated Track Section

150mm/5.90"
Walthers Part # 426-10153, p. 76 Walthers 2003 Big Trains Reference
G scale, $31.98, currently in stock at Walthers

 
One rail is insulated on this section that is often used to create insulated stop sections at signals. Concealed terminals allow for easy power connections. 150mm long.