_____ number is the ratio between inertia and viscous forces.

_______ permits track circuiting.

________ are transverse ties on which the rails are laid.

The Wheels of Rolling stock have slope ____

The Velocity at which flow changes from viscous to turbulent is called ______ velocity.

___________ flow the liquid particles move along straight parallel paths.

_________ is a structure made up of several members connected to each other.

The frictional resistance is __ to the surface area of contact.