(a) A State is eligible for a grant from FRA under this section for any construction project for the improvement of the route or structure of a rail line that either:

(1) Is carried out for the purpose of mitigating the adverse effects of rail traffic on safety, motor vehicle traffic flow, community quality of life, or economic development; or

(2) Involves a lateral or vertical relocation of any portion of the rail line.

(b) Only costs associated with construction as defined in § 262.3 will be considered allowable costs.