E. C. L.
Edwin M. Post was the President of Express Coal Line. From The Who's Who in New York, 1904:
Edwin M. Post: Banker; born Jan. 6, 1870, Cincinnati, Ohio; educated at Columbia University.Married. Member of firm of Thomas & Post, members of New York Stock Exchange; president of Express Coal Line and Georgia Car Co.; vice-president of Southern Iron Car Line ; secretary, treasurer and director Manhattan Car Trust Co.; secretary and director Louisville, Henderson & St. Louis R. R. Co. Member Tuxedo, Lambs, Union, St. Anthony, Knickerbocker, Larchmont Yacht, and Seawanhaka-Corinthian Yacht Clubs, Sons of Revolution and Down Town Association. Residence, 18 West 10th St. Office, 71 Broadway, N. Y.
A few days ago this site featured a post on one of the charter members of the Larchmont Yacht Club and his suicide in 1907. Mr Post is cited above as being a member of the club. I suppose that Mr. Post must have known Bill Alley quite well. See the original William S. Alley post here.