Bridges. Compensation for use of highway bridge by electric railways, report to accompany S. 1847 [to amend act to provide for eliminating grade crossings on line of Baltimore and Potomac Railroad Company in Washington, D. C., and requiring said company to depress and elevate its tracks, and to enable it to relocate parts of its railroad therein, so as to change method of taxation for use of highway bridge across Potomac River by electric railways]; submitted by Mr. Cameron.