Here are the key dates around the DRGW + SP merger …
September 25, 1987:
Rio Grande Industries announced its intention to purchase the Southern pacific Transportation Co., from the Santa Fe Southern Pacific Corporation, the merged parent company of the two AT&SF and SP railroads. With the failed SPSF merger, denied by the ICC on June 30, 1987, the ICC ordered SFSP Corp., to divest itself of one or both of its railroads. (Pacific Rail News, Issue 290, January 1988, page 36)
December 28, 1987:
Santa Fe Pacific Corp., announced its intention to sell the Southern Pacific Transportation Co., to Rio Grande Industries. RGI announced that it would file the intended sale with the ICC on or about February 22, 1988. (Pacific Rail News, Issue 291, February 1988, pages 7, 12)
August 9, 1988:
Rio Grande Industries received ICC approval for its purchase and control of Southern Pacific Transportation Company. (August 9, 1988 Rio Grande Industries news release; Pacific Rail News, Issue 300, November 1988, page 4; Trains, Volume 48, Number 12, October 1988, page 8; CTC Board, Issue 154, July 1988, page 3, full page of coverage)
The ICC approved the sale of Southern Pacific Transportation Co. to Rio Grande Industries, for the amount of $1.02 billion. The new combined D&RGW and SP system will be 15,000 miles in 15 states, and will be the fifth largest railroad in the U.S. (Wall Street Journal, August 10, 1988; Pacific Rail News, Issue 299, October 1988, page 7)
August 25, 1988:
The Interstate Commerce Commission approved the acquisition of control of the Southern Pacific Transportation Company by Rio Grande Industries, Inc., SPTC Holding, Inc., and the Denver and Rio Grande Western Railroad Company (DRGW). (Rio Grande Industries, et al.— Control—SPTC et al., 4 I.C.C. 2d 834)
October 13, 1988:
Rio Grande Industries took control of Southern Pacific Transportation Co. (CTC Board, Issue 159, May 1989, page 18)