<br> Resistor R112 is a optimistic feedback network to provide circuit snap motion. Further, whereas the over-temperature detection circuit makes use of positive temperature characteristics of wire W, it's understood that reverse logic can be utilized if wire W is selected to have destructive temperature coefficient characteristics. Resistor R112 is a optimistic suggestions that gives snap action when the threshold is reached. The limiting velocity of steam trains is about 80 or 90 miles per hour, whereas speeds of 130 miles per hour have been reached in assessments on electric trains. It has been adopted for one installation in this nation during which it's desired to extend the schedule speed on an extended mountain division. As a direct result of this the schedule pace is elevated
