(0.625) inch below the top of the rail head. The

both tangent and curved track is zero.

alinement measurement is the distance in inches

from the midpoint of the stringline to the gage side

of the line rail. It is measured at right angles to the

(1) At any location where the warp exceeds

stringline.

1 (1.75) inches, operations shall not exceed 10

mph.

designated alinement is zero. For curved track the

(2) At any location where the warp exceeds

designated alinement is the degree of curvature. In

2 (2.50) inches, operations shall not exceed 5

spirals the change in curvature will be at a uniform

mph.

rate.

(3) Operations shall not be permitted over

any location where the measured warp is greater

distance from the stringline to the line rail equals

than 3 (3.00) inches.

approximately 1 degree of curvature, as shown in

figure 12-5. If the degree of curvature is not

known, it can be determined as follows:

(1) Beginning at a point near the center of

the curve, mark at least two stations spaced 31 feet

of the rails in a horizontal plane.

apart in both directions along the line rail.

midpoint of a 62-foot stringline stretched along the

gage side of the line rail at a distance of %