On May 5, 1985, the last significant change in route identification policy was made after the TA had decided in 1981 that the single and double letter system of the original IND was no longer meaningful, given that there were many services that were express for part of their route and local for other parts. In most cases, this was accomplished by simply eliminating the second letter in route designations. There is no longer a letter designation for specials (formerly "S").