As she let up, they found traction and the car shot out of the driveway.
It is served by the Pennsylvania, the Philadelphia & Reading and the Lancaster, Oxford & Southern railways, and by tramways of the Conestoga Traction Company, which had in 1909 a mileage of 152 m.
Traction engines are also largely used.
- The external forces acting on a bridge may be classified as follows: (t) The live or temporary load, for road bridges the weight of a dense crowd uniformly distributed, or the weight of a heavy wagon or traction engine; for railway bridges the weight of the heaviest train likely to come on the bridge.
Tramways with mechanical traction have developed rapidly.