**Tw**, Tentacle root.- Multiplying through by w we obtain
**Tw**= 2FwD = 2µWwD = RV (4) This is a fundamental energy equation for any form of locomotive in which there is only one driving-axle. - If there are several driving-axles in a train, the product
**Tw**must be estimated for each separately; then the sum of the products will be equal to RV. - The power of a motor is measured by the rate at which it works, and this is expressed by
**Tw**=T 60N in foot-pounds per second. - Kai Tote SLa/3Xii€ 1 lcsa%E1v TO KO.p¢OS TO 'iv'
**TW**643aXpW T06 6.5EX(60U e ov.

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