Radio frequency (RF) induction heating has been proposed as an alternative deicing technique for automatic guideway transit (AGT) collector rails under adverse weather conditions. The concepts of a practical RF deicing system are discussed. A working frequency of 450 kHz is used for the RF generator, and 430 magnetic stainless steel is selected as the rail-capping material for efficient coupling. Experimental setup for a model RF deicing system is described. With 2.5-kW RF generator power, successful deicing was accomplished up to a rail speed of 3.2 km/h for rail temperatures as low as-30 C. The performance of this test system is assessed, and possible future improvements are suggested.

In recent years, many automatic guideway transit (AGT) systems have been developed. These systems are designed to transport people and cargo over short distances safely and automatically. In general, they all employ sophisticated computers and other electronic equipment to provide operational efficiency and flexibility. Under normal weather conditions they are very reliable. However, frequent shutdown does occur during periods of severe cold weather. One of the main reasons for system failure is the interruption of power and signal communications due to frost and ice formation on the collector and conductor rails. Icing of power and/or signal rails occurs frequently and often before the loss of traction due to winter weather. Various snow-and ice-control methods have been adopted or suggested (1). Most of the feasible approaches fall into one-of the following categories: