Both Southern and Central of Georgia received SD35s built in January 1966, they were the very last of that model.
First SD45 #4351 was built in December 1965, not February. First SD40X #434 was built in July 1964, four more SD40Xs #434A-D were built in February 1965 and the final four SD40Xs #434E-H were built in April 1965. The GP40X #433, was built in May 1965. First SD40s were built in January 1966, First GP40s in November 1965. First GP38s were built in January 1966. First SW1500 was EMD #107 in June 1966. First Production SD45 in May 1966 was the Great Northern's #400 Hustle Muscle. First SD38 was B&LE #861 in May 1967. First SD39 was SP #5300 in August 1968. Diesel data from A J Kristopans EMD Serial Number Page.
Justin B wrote:Production of the 35 line ended in January 1966, so NS 2993 would have been among the last built. The "1966" line really went into production in 1965 with the SD45 in Febuary and prototype SD40x and GP40x units being built later in November of the same year. 1966 saw production of the 40's start, with the 38's following in 1967 and 39's in 1968.