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Mode 7 is an endless program for a loop with two trains: one on the mainline and one on a siding. The TCS Automatic Unit controls point switching and starting/stopping of the trains. 4 sensors are embedded into the Tomix Wide PC track; 2 (S2 and S1) in the siding and 2 (S4 and S3) in the mainline. Actually, only S3 and S2 are used normally. The other two are backups just in case the primary sensors fail to detect the train passing over them. Typically the sensor may be fitted to either the S140 and S70 Wide PC straights by punching out a center strip to create a slot for the sensor.
