Which of the following is the weakest part in the railway track?

_____ number is the ratio between inertia and viscous forces.

Strut is a tension member.

A frame which is composed of members just sufficient to keep it in equilibrium, such frame is _______

________ are transverse ties on which the rails are laid.

________ are made of high carbon steel to withstand heavy stresses.

Rectangular channel is _____ channel.

_______ permits track circuiting.