. Electric railway journal . and that the next block is clear. Another important feature of protection is that whichpermits a train to approach the siding at high speed ineither direction on the main line. The automatic sig-nals are controlled by track circuits, which extend fromsignal to signal. By this means a clear signal guaran-tees that the main-line track is free from there are sidings leading into the main linetrack, the track circuit is carried back into the sidingto a fouling point. This guarantees that cars mustbe pulled into the siding so as not to foul a traino
. Electric railway journal . and that the next block is clear. Another important feature of protection is that whichpermits a train to approach the siding at high speed ineither direction on the main line. The automatic sig-nals are controlled by track circuits, which extend fromsignal to signal. By this means a clear signal guaran-tees that the main-line track is free from there are sidings leading into the main linetrack, the track circuit is carried back into the sidingto a fouling point. This guarantees that cars mustbe pulled into the siding so as not to foul a trainon the main line before the signals on the main linewill clear. This is a strong point in favor of theuse of automatic block signals where freight operationis contemplated. There is a tendency, especially wheresidings are crowded, to allow cars to foul the mainline. The illustration also shows the location of the in-sulated rail joints which determine the limits of thetrack circuit as it extends into the siding. At the point. BLOCK SIGNAL PROTECTION FOR FREIGHT OPERATIONON ELECTRIC RAILWAY LINES SIGNAL PROTECTION FOR A BELT-LINE FREIGHTCUT-OFF ON THE I. T. S. direction of the arrow, while signal No. 7 governs trainsmoving in the opposite direction. The freight cars shown in the siding are protectedbecause signal No. 1 displays a proceed signal would be in the stop position if switchpoint 2 were not closed. This feature of protection isaccomplished by the use of a switch circuit controller, 3,which is mechanically connected to the switch in turn is equipped with contacts of such a de-sign as to permit a fine adjustment, which causes thecircuit controlling signal No. 1 to be taken over thecontacts in switch circuit controller 3. Whenever theswitch point 2 is not closed to within I in. of its fullstroke, the control circuit for signal No. 1 is inter-rupted. This control of signal No. JL not only guarantees pro-tection to the cars in the siding but also pr
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